Answer: AMSOIL products have been available since 1972. AMSOIL 10W-40 Motor Oil was the first synthetic motor oil to meet American Petroleum Institute (API) service requirements. Today, AMSOIL manufactures synthetic lubricants for virtually all automotive, power sports, commercial and industrial applications.

Answer: Yes. Synthetic oil is perfectly safe for use in new or high-mileage engines.

Answer: No. AMSOIL Synthetic motor oils can be safely used during break-in. In fact, many vehicles, including the Dodge Viper and Chevrolet Corvette, are factory filled with synthetic oil.

Answer: No matter how well motor oil is formulated, it won’t last forever. Motor oil marketers and vehicle manufacturers have developed general recommendations for the maximum amount of time or miles that the oil can be used; typically these intervals fall between 3,000 and 7,500 miles, depending on the type of service.

Many AMSOIL motor oils are specially formulated for extended drain intervals and provide maximum protection longer than other oils. Check the product data sheet for specific recommendations.

Answer: No. Synthetic oils do not cause engines to leak oil. In fact, AMSOIL motor oil is fully compatible with modern seal materials and is properly formulated to condition seals, keeping them pliable to prevent leakage.

Answer: Yes. AMSOIL motor oils can be mixed with other motor oil brands; however, mixing AMSOIL products with other brands may decrease the effectiveness of AMSOIL oils and will compromise their extended drain capability. Mixing other oils with AMSOIL motor oils may also void the AMSOIL limited warranty.

Answer: As the developer of the world's first API qualified synthetic motor oil in 1972, AMSOIL has gained more experience than any other oil company in formulating automotive synthetic lubricants. It is this extensive experience that provides the ability to maximize product performance through use of a full range of high-performance synthetic base oils. AMSOIL views synthetic base oils the same as it views additives, with each having its own set of unique properties. AMSOIL engineers its lubricants with the synthetic base oil or combination of base oils best suited to a specific lubricant’s application demands (gasoline, diesel, racing, transmission, gear, extended drain, extreme temperature, etc.). AMSOIL INC. maintains an unwavering commitment to provide products that outperform the competition and deliver maximum benefits to all AMSOIL customers. Performance is the bottom line.

Answer: AMSOIL Synthetic Blend Diesel Motor Oil (PCO) is formulated with synthetic and petroleum fluids. They are combined to form an all-season motor oil that demonstrates many of the performance features of full synthetic lubricants.

Answer: AMSOIL engine oils are formulated using premium synthetic base oils, and the highest quality additives, that provide extended-drain capabilities. Formulated with high quality additives, AMSOIL engine oils achieve greater cleaning powers, while providing better equipment protection over longer oil drain intervals. AMSOIL’s unique synthetic formulation, and robust TBN retention, works to resist oxidation and neutralize the acids that shorten the service life of other oils. AMSOIL’s strong resistance to high temperature volatility (burn-off) helps reduce oil consumption, while maintaining viscosity over longer periods of time than other oils. Please check the product data sheet for specific recommendations.

Answer: AMSOIL motor oils can reduce oil consumption in mechanically sound engines. However, AMSOIL motor oils cannot fix engines that consume oil because of mechanical problems.

Answer: There are no special requirements for changing to AMSOIL motor oil. However, in older vehicles with high mileage, it may be advisable to use AMSOIL Engine Flush first. This will ensure the engine is clean and free of accumulated contaminants which may affect on the service life of AMSOIL motor oil. It is recommended that an AMSOIL Absolute Efficiency Oil Filter (EaO) be installed at every oil change.

Answer: The importance of good-quality oil in your engine cannot be stressed enough. AMSOIL synthetic motor oils consistently outperform other conventional and synthetic oils in virtually every category of performance, including wear protection, extreme high and low temperature performance, foam control, viscosity retention, rust and corrosion protection, volatility and fuel economy. While other brands may have good performance in a few of these areas, AMSOIL consistently performs at the top in every category. Drivers can have confidence knowing that AMSOIL motor oils provide maximum performance and protection.

Answer: Each vehicle manufacturer defines “normal” and “severe” driving conditions for their equipment; AMSOIL recommends owners check these definitions in their owner’s manual to determine the service condition in which they typically drive.

AMSOIL defines normal service as personal vehicles frequently traveling greater than 10 miles at a time and not operating under severe service.

AMSOIL defines severe service for gasoline engines as turbo/supercharge engines, commercial or fleet vehicles, excessive engine idling, use of AMSOIL engine oil in vehicles with more than 100,000 miles without prior regular use of AMSOIL engine oil, daily short-trip driving less than 10 miles (16km), frequent towing, plowing, hauling or dusty-condition driving.

AMSOIL defines severe service for diesel engines as extensive engine idling, daily short-trip driving less than 10 miles (16km) or frequent dusty-condition driving.

See the AMSOIL Product Recommendation and Drain Interval Chart, publication number G1490, for additional information.

Answer: Yes. Because AMSOIL motor oils are formulated with premium synthetic base oils, they have superior high and low-temperature performance. Synthetic oils resist thinning out at high temperatures to maintain critical protection in extreme heat. They also minimize sludge and deposit formation in high-temperature operation. AMSOIL synthetic motor oils resist thickening in cold temperatures to provide rapid cold starts and improved low-temperature operation compared to conventional oils.

Answer: A significant portion of an oils performance and specification compatibility comes from the additive components blended in the oil. AMSOIL offers multiple oils with the same viscosity because they are formulated with different additive packages that carry different manufacturer oil specifications. This allows AMSOIL to provide premium oil for more equipment manufacturers and industry specifications than would be possible if only a single viscosity grade was offered.

Answer: AMSOIL XL Series Motor Oils have a recommended oil drain interval of 10,000 miles or 6 months, whichever comes first. AMSOIL top-tier motor oils carry a drain interval of 25,000 miles or 1 year, whichever comes first. AMSOIL top-tier motor oils incorporate better base-oils and have more robust additives, which allow for longer extended drains than AMSOIL XL Series Motor Oils.

Answer: AMSOIL Dominator Racing Oils are premium quality oils formulated for maximum protection in high-performance and racing applications. Dominator Racing Oils are fortified with high levels of zinc and phosphorus, which are incompatible with catalytic converters common in today’s street-driven vehicles; therefore, they do not carry API service classifications required by many standard passenger vehicles. However, AMSOIL Racing Oils are the ideal recommendation for street rods, muscle cars and other high performance vehicles driven on the street.

Answer: The “W” in 5W-30 motor oil stands for “winter” and represents that the oil meets or exceeds certain criteria for good low-temperature performance. Oil with SAE viscosity grade 5W-30 will behave like an SAE 30 oil at high temperatures and SAE 5W oil at low temperatures, providing the necessary fluidity for rapid starts and efficient engine operation at low temperatures.

Answer: What may be normal oil consumption for one vehicle may be excessive for another. As a rule, the more miles and wear accumulated on an engine, the more oil that engine will consume. Typically, one quart of oil within 3,000 miles is normal, but you should confirm oil consumption limits with the vehicle manufacturer. The following document explains mechanical related issues that can lead to oil consumption: Engine Oil Consumption

Answer: Yes. AMSOIL Engine Flush (AEF) is safe to use in gasoline and diesel engines. This multi-use formulation helps loosen sticky valves and piston rings. It also helps reduce lifter noise and removes sludge and deposit buildup for clean operation and lower operating temperatures.

Answer: It depends; some AMSOIL diesel oils carry gasoline specifications. Check the product data bulletin for specific product and drain interval recommendations.

Answer: Yes. The CJ-4 specification is for 2007 and later high-speed, four-stroke diesel engines. AMSOIL 5W-40 Premium API CJ-4 Synthetic Diesel Oil (DEO) and AMSOIL 15W-40 Premium API CJ-4 Synthetic Diesel Oil (DME) are formulated to meet the sulfur content requirements necessary to be compatible with exhaust after treatment systems and/or extended drain intervals.

Answer: Yes. AMSOIL CJ-4 oils are formulated with lower sulfur content to be compatible with 2006 and later high-speed, four-stroke diesel engines with exhaust after treatment systems and/or extended drain intervals. AMSOIL 5W-40 CJ-4 Synthetic Diesel Oil and 15W-40 CJ-4 Synthetic Diesel Oil exceed previous diesel oil specifications, meaning they are suitable for use in older diesel engines. CJ-4 oils exceed performance criteria for CI-4 Plus, CI-4, CH-4, CG-4 and CF-4 and can be safely used in place of those oils.

Answer: Both AMSOIL 5W-40 and 15W-40 diesel oils are multi-grade oils, meaning they have good performance in high and low temperatures. AMSOIL 5W-40 and 15W-40 will both behave like SAE 40 grade oils in high temperatures; however, the 5W-40 will be thinner than the 15W-40 at cold temperatures.

Answer: Model 2007 and newer diesel engines are fitted with exhaust after treatment systems necessary to meet current minimum emissions requirements and are sensitive to the sulfur content of the oil. CI-4 and CI-4 Plus oils typically contain too much sulfated ash to be compatible with these after treatment systems. As always, when in doubt, check the specification of the oil to determine the suitability of the oil for your intended application. AMSOIL INC. recommends following the manufacturer recommendations specific to the diesel oil rating called for in the specific model/year vehicle.

Answer: Yes. During operation the 10W-30 motor oil will perform like SAE 30 motor oil, and it is safe to use in an application requiring straight SAE 30 oil. If starting the small engine in temperatures below 50°F, the multi-grade oil may improve starting.

Answer: Yes. AMSOIL Formula 4-Stroke 0W-40 (AFF) is specifically formulated for use in small, hard working four-stroke engines. It is ideal for four-cycle snowmobiles, ATVs, personal watercraft, four-stroke boat motors, lawn equipment, etc.

Answer: Yes. AMSOIL Signature Series 0W-30 Synthetic Motor Oil (SSO) can be used in lawnmower applications calling for SAE 30 weight engine oil. However, due to its robust formulation specifically designed for hot temperature, severe service operation of small engines AMSOIL 4-Stroke 10W-30/SAE 30 Synthetic Small Engine Oil (ASE) is recommended.

Answer: Yes. There are no problems using AMSOIL 2-cycle oils for break-in periods.

Answer: Wet clutches are immersed in motor oil to cool the clutch plates. Wet clutches are often found in motorcycle applications and they require fluids with certain frictional requirements to promote smooth shifting and clutch engagement. Dry clutches require no lubrication.

Answer: AMSOIL INTERCEPTOR™ Synthetic 2-Cycle Oil (AIT) is recommended for power valve applications. It has optimal detergency to keep power valves clean and provides superior anti-wear protection.

Answer: Using AMSOIL Saber Professional (ATP) or AMSOIL Saber Outboard (ATO) at 100:1 mix ratios, where 50:1 is recommended by the manufacturer, will not void warranties. For more information, contact AMSOIL Technical Services at (715) 399-8324.

Answer: Because AMSOIL builds an extremely shear-stable product, AMSOIL Formula 4-Stroke 0W-40 (AFF) can be used in place of SAE 50 oil in some cases. Contact AMSOIL Technical Services for specific product interchange information.

Answer: AMSOIL SAE 20W-50 Synthetic Motorcycle Oil (MCV) and Synthetic SAE 60 Motorcycle Oil (MCS) are the most commonly recommended oils for Harley applications.

Answer: AMSOIL 10W-40 Synthetic Motor Oil (MCF) contains an additive package that is designed for the extreme pressures and high temperatures common in motorcycle applications. Its high TBN retention also makes it the appropriate choice for extended drain intervals. In scooter applications, AMSOIL 10W-40 Synthetic Scooter Oil (ASO) is the more economical choice.

Answer: In newer Big Twins, AMSOIL recommends AMSOIL 20W-50 Synthetic Motorcycle Oil (MCV) or SEVERE GEAR® Synthetic Extreme Pressure Lubricant 75W-110 (SVT). In older Harleys, such as Knuckleheads, Panheads and Shovelheads, AMSOIL Synthetic SAE 60 Motorcycle Oil (MCS) is recommended.

Answer: AMSOIL recommends 20W-50 Motorcycle Oil (MCV) for the Harley-Davidson Sportster.

Answer: Yes. AMSOIL Motorcycle Oils meet JASO MA2 friction requirements for use in wet clutch applications.

Answer: AMSOIL Series 2000 Synthetic Chaincase Lubricant (TCC) does not have the correct viscosity for use in Harley-Davidson primaries, and is not recommended for these applications. AMSOIL recommends a product such as AMSOIL Synthetic 20W-50 (MCV) Motorcycle oil for Harley-Davidson primaries.

Answer: AMSOIL Motorcycle Oils are engineered with additive packages specifically designed to provide higher performance in motorcycle engines, transmissions and primaries.

Answer: AMSOIL motorcycle oils are engineered to provide protection up to twice the manufacturer’s recommended change interval or one year, whichever comes first.

For Big Twin Harley-Davidson transmissions, follow the Harley-Davidson recommended drain interval for synthetic oil up to 20,000 miles or one year, whichever comes first. Unless you are using an AMSOIL Ea air filter, change the filter based on the manufacturer’s recommended intervals.

Answer: Yes. In addition to withstanding extreme pressure, protecting against rust and withstanding high temperatures, motorcycle oils must be compatible with wet clutches. AMSOIL motorcycle oils are designed to meet the unique frictional requirements necessary for wet clutch compatibility and provide maximum protection and performance in these applications.

Answer: AMSOIL offers motorcycle oils in different viscosities to accommodate the differences between motorcycle models and manufacturers. Just as in automotive applications, motorcycle engines require specific oil viscosities for optimal performance and protection based on the components and tolerances in the engine. Check the AMSOIL on-line look-up guide for specific recommendations.

Answer: AMSOIL Synthetic Universal Automatic Transmission Fluid (ATF) and Synthetic Fuel Efficient Automatic Transmission Fluid (ATL) are recommended for use up to 50,000 miles in severe service operation and up to 100,000 miles in normal service operation, or per vehicle manufacturer recommendations, whichever is longer. Use vehicle manufacturer or transmission manufacturer definitions for normal and severe service, as these can vary among manufacturers. Check the AMSOIL on-line look-up guide for specific recommendations.

Answer: No. AMSOIL Synthetic Universal Automatic Transmission Fluid (ATF) and AMSOIL Synthetic Fuel Efficient Automatic Transmission Fluid (ATL) are compatible with petroleum and synthetic transmission fluids and can be used to top off transmission fluid levels. However, if conducting a transmission fluid change, most of the fluid in the automatic transmission will be replaced with the new fluid.

Answer: AMSOIL Engine and Transmission Flush (FLSH) is safe to clean sludge and deposit buildup from automatic transmissions to promote efficient operation and fuel efficiency. AMSOIL Engine and Transmission Flush is not recommended for manual transmissions, CVT transmissions, transaxles or differentials. AMSOIL recommends that the transmission filter be changed when performing a flush.

Answer: AMSOIL offers two manual transmission fluids: Synthetic Manual Synchromesh Transmission Fluid 5W-30 (MTF) and Synthetic Manual Transmission and Transaxle Gear Lube 75W-90 (MTG).

Manual Synchromesh Transmission Fluid 5W-30 (MTF) is engineered for 50,000 mile service intervals or longer (up to 150,000 miles) as indicated by the equipment manufacturer. Manual Transmission and Transaxle Gear Lube 75W-90 (MTG) is engineered to last two times longer than conventional petroleum GL-4 gear oils. Following equipment manufacturer drain intervals for synthetic oils is recommended. Check the AMSOIL on-line look-up guide for specific recommendations.

Answer: Yes. AMSOIL Engine and Transmission Flush is compatible with engine and transmission seal materials. In fact, this product is specially formulated to condition seals to help prevent leaks and extend seal life.

Answer: A filter’s micron rating refers to the smallest size contaminant the filter media can remove; however, there is no correlation between micron rating and a filter’s efficiency percentage.

The beta ratio test measures a filter’s efficiency for removing particles of a certain size by comparing the amount of contaminant particles before and after filtration. The number of particles after filtration is divided by the number before filtration. The resulting number is the beta ratio. AMSOIL Ea filters have a minimum beta ratio of 75, meaning they are capable of removing 98.7% of contaminant particles of a stated size.

Answer: AMSOIL Ea Air Filters are not washable, but should be cleaned by vacuum or shop air every 25,000 miles or one year, whichever comes first. Clean the filter housing with a cloth, use care to avoid knocking contaminants into the air inlet.

To vacuum, carefully vacuum the filter media on the dirty side. If using shop air, blow the filter media at a 45-degree angle on the clean side, using low-pressure air (15 – 20 psi).

Answer: Yes. Non-AMSOIL brand filters may be used with AMSOIL lubricants. However, the manufacturer recommended change intervals and cleaning procedures should be followed. AMSOIL supports the full 10,000 mile/6 month XL Motor Oil drain interval with any non-AMSOIL oil filter.

Answer: AMSOIL Ea By-Pass Filters are engineered to last 60,000 miles when used in conjunction with an AMSOIL Ea full-flow oil filter and AMSOIL motor oil. Ea By-Pass Filters used with another brand of full-flow filter or motor oil should be changed every other full-flow filter change.

Answer: No. Filter recommendations by AMSOIL are based on specific equipment manufacturer requirements. Using a filter in an application it is not recommended for will void the filter’s limited AMSOIL warranty.

Answer: AMSOIL By-Pass Filters are designed to filter out fine particles; they are not meant to extend oil change intervals beyond original recommendations. However, when fine particles are filtered out of the motor oil, it may be possible to attain longer drain intervals. This should be determined by used oil analysis. In addition, the use of an AMSOIL bypass system may allow for the use of larger oil filters, which can increase filtering capacity.

Answer: When properly maintained, AMSOIL Ea Air Filters are guaranteed for up to four years or 100,000 miles, whichever comes first.

When used in conjunction with AMSOIL motor oil, AMSOIL EaO oil filters are guaranteed for up to 25,000 or one year in normal service and up to 15,000 miles or one year in severe service. AMSOIL Ea15K oil filters carry a 15,000 mile change interval, or one year, whichever comes first, regardless of driving conditions. It is recommended that all AMSOIL brand oil filters be changed when the motor oil is changed. If motor oil other than AMSOIL is used, the AMSOIL Ea Series oil filter must be changed at the recommendation of the vehicle manufacturer.

See the list below for EaO oil filter change interval recommendations, by part number:

25,000 mile, or 1 year, EaO filters: EaO64, EaO35, EaO34, EaO38, EaO37, EaO30, EaO59, EaO23, EaO11, EaO48, EaO42, EaO25, EaO96, EaO27, EaO52, EaO15, EaO24, EaO88, EaO80, EaO26, EaO99

15,000 mile, or 1 year, Ea15k filters: Ea15K09, Ea15K10, Ea15K12, Ea15K13, Ea15K20, Ea15K29, Ea15K32, Ea15K33, Ea15K46, Ea15K50, and Ea15K51.

Answer: Yes. AMSOIL fuel additives are compatible. When selecting a fuel additive be sure that it is the appropriate choice for the application. Visit www.amsoil.com for more information on fuel additives, or call Technical Services at (715) 399-TECH (8324).

Answer: AMSOIL P.i. is the most potent gasoline additive available today. It helps maintain peak engine efficiency, fuel economy, power and drivability in newer low mileage engines. As a concentrated detergent, it is unsurpassed in cleaning combustion chamber deposits, intake valve deposits and port fuel injector deposits.

Answer: Yes. AMSOIL Quickshot ™ SE (AQS) contains a revolutionary technology that focuses on three major fuel-related issues plaguing small engines and power sports equipment: ethanol, water and dirty pump gas. Ethanol in fuel has a tendency to absorb water and separate from the gasoline. It then sinks to the bottom of the gas tank, where it quickly degrades and creates gum, varnish and other insoluble debris that can plug fuel flow passages and negatively affect engine performance. When this ethanol/water mixture is pulled into the engine, it creates a lean burn situation that increases combustion chamber temperatures and can lead to engine damage. AMSOIL Quickshot™ SE is proven to successfully fight ethanol problems and improve operation.

Answer: AMSOIL Gasoline Stabilizer (AST) should be used when fuel is stored for long-term, seasonal storage. For short- to medium-term storage, Quickshot™ SE is recommended.

Answer: Yes. AMSOIL Diesel Concentrate (ADF) is compliant with the federal requirements for ULSD. AMSOIL Cetane Boost (ACB) and Cold Flow Improver (ACF) also meet USLD requirements.

Answer: AMSOIL Cold Flow Improver (ACF) is designed to prevent fuel from gelling and clogging fuel lines and filters. If the fuel is beginning to gel, the fuel should be treated with AMSOIL Diesel Recovery Emergency Fuel Treatment (DRC). Diesel Recovery disperses the wax crystals and allows the fuel to flow.

Answer: Yes. AMSOIL Engine and Transmission Flush (FLSH) is safe for use in diesel and gasoline engines and automatic transmissions to help restore equipment efficiency and operation. AMSOIL Engine and Transmission Flush is not recommended for manual transmission, CVT transmissions, differentials, transaxles, small engines or power sports equipment.

Answer: Elevated cetane levels, generally above 50, are preferable to get the most performance and power out of diesel engines. AMSOIL Cetane Boost (ACB) is engineered to improve the cetane value of diesel fuel up to seven points. AMSOIL Cetane Boost is appropriate for all types of service, including heavy- and light-duty service, on- and off- road and marine diesel engines. Cetane Boost is compatible with biodiesel and all types of exhaust emissions systems and is excellent for use with Ultra Low Sulfur Diesel Fuel (ULSD). AMSOIL Cetane Boost also improves operating cost by improving fuel economy, provides complete combustion for better power, reduces white smoke and emissions, and improves cold temperature starting.

Answer: Using AMSOIL synthetic motor oil has no affect on vehicle warranties. A federal law called the Magnuson-Moss Act (1975) prevents original equipment manufacturers from putting conditions on vehicle warranties attached to any product or service identified by brand, trade or corporate name, unless the manufacturer provides that product or service free of charge. This means consumers have the freedom to use aftermarket products of their choice without fear of losing the original limited or implied vehicle warranty. For additional information, contact AMSOIL Technical Department (715) 399-TECH (8324).

Answer: No. Extending oil change intervals will not void new vehicle warranties. To affect the vehicle warranty, it must be determined that the lubricant was directly responsible for the failure; if the oil didn’t cause the problem, the warranty cannot be voided, regardless of brand or length of time in use.

Answer: Yes. AMSOIL provides a limited warranty on all AMSOIL lubricants and filters.

Answer: Call the AMSOIL Technical Department at (715) 399-TECH (8324) with questions or issues regarding warranties.

Glossary of Acronyms and Common Terms

Answer: AMSOIL provides a number of product lookup and filter lookup guides to help determine the appropriate lubricant or filter for an application. The following lookup guides are available to determine proper recommendations: Auto and Light Truck, Power Sports, Small Engine, Vintage Vehicle, Filter Cross Reference, and Heavy Duty.

Answer: Oil analysis is a process for determining the chemical properties of a lubricant. It’s often used to detect mechanical issues before major failures occur. Used oil samples are analyzed for specific physical properties, contaminant levels and wear debris from the equipment to determine if the oil can remain in service. Oil analysis can also monitor the wear rate of the equipment and detect if wear is elevated beyond acceptable limits. It is often used as part of a preventative maintenance program.

Answer: As part of a preventative maintenance program, oil analysis can help owners and operators be proactive in their maintenance practices to help increase equipment productivity and eliminate costly downtime. The cost of routine oil analysis far outweighs the costs to replace major equipment on large industrial equipment, commercial and passenger car vehicles.

For those reluctant to extended oil intervals, oil analysis provides evidence that AMSOIL motor oils have exception performance and protection capabilities in extended service.

Answer: Yes. Fisher Resource Solutions® provides oil analysis services through Oil Analyzers Inc. Visit www.oilanalysis.us or call (866) 292-4700 for more information.

Answer: Yes. AMSOIL Antifreeze and Engine Coolant (ANT) is compatible with all engine and cooling system components. It surpasses all ASTM standards for metallic corrosion to protect metals and provide uncompromised cooling protection.

Answer: AMSOIL recommends deionized or distilled water when mixing with AMSOIL Antifreeze and Engine Coolant (ANT). Using deionized or distilled water prevents adding harmful contaminants that can negatively affect the antifreeze product and cooling system equipment.

Answer: Yes. AMSOIL Antifreeze and Engine Coolant (ANT) contains proprietary poly-organic acid technology that is silicate and borate free.

Answer: No. All gear oils AMSOIL recommends for manual transmission applications are perfectly safe for synchronizer materials.

Answer: AMSOIL automotive gear lubricants have excellent frictional properties and generally will not need to be fortified with additives. If on rare occasions differential chatter occurs, AMSOIL Slip Lock is recommended.

Answer: AMSOIL gear lubricants are compatible with one another. Mixing different AMSOIL gear lubricants, however, could change the viscosity properties of the oils, depending on the ratios and viscosities mixed. This could impact the drain interval. Mixing different viscosities of lubricants should be minimized whenever possible.

Answer: No. In most cases using 75W-140 gear oil is too heavy to be used in place of the recommended 75W-90. If higher viscosity gear oil is desired, AMSOIL would typically recommend a 75W-110 viscosity. A modified or non-stock differential may call for heavier oil. Call the AMSOIL Technical Department for assistance at (715) 399-TECH (8324).

Answer: Yes. As long as temperatures don’t exceed 250°F (121°C), all AMSOIL automotive gear oils are safe to use in drive train applications with yellow metals. Check the AMSOIL on-line look-up guide at www.amsoil.com for specific questions.

Answer: AMSOIL automotive gear lubricants are compatible with RTV sealant. It is very important the RTV sealant manufacturer’s instructions be followed and the product be FULLY cured before contact with the gear lubricant.

Answer: Yes. In newer Big Twins, AMSOIL recommends AMSOIL 20W-50 Synthetic Motorcycle Oil (MCV) or SEVERE GEAR® Synthetic Extreme Pressure Lubricant 75W-110 (SVT). In older Harleys, such as Knuckleheads, Panheads and Shovelheads, AMSOIL Synthetic SAE 60 Motorcycle Oil (MCS) is recommended.

Answer: AMSOIL automotive gear lubricants are compatible with other synthetic and petroleum based gear lubricants. However, mixing AMSOIL gear oils with oils will shorten the life expectancy and reduce performance benefits.

Answer: Yes. AMSOIL Synthetic Automatic Transmission Fluid (ATF) is engineered to provide maximum performance and protection in a number of automatic transmission applications. AMSOIL Synthetic Automatic Transmission Fluid is formulated for Mercon V applications and is backward compatible, meaning it is also suitable for Mercon applications.

Answer: No. The Mercon specification precedes the Mercon V specification; therefore, it is not formulated to adequately protect and perform in Mercon V applications. AMSOIL Synthetic Automatic Transmission Fluid (ATF) is engineered to exceed Mercon V and Mercon specifications and can be used in both applications.

Torque-Drive® Synthetic Automatic Transmission Fluid is engineered to meet the Mercon specification and is not recommended for Mercon V applications.