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The average operating temperature of a passenger car/light truck engine is up to 235ºF, and higher under heavy loads. Motorists are becoming more familiar with the technologies responsible for this increased heat, specifically turbochargers and direct fuel injection. Automakers are designing engines using these performance-enhancing technologies to keep pace with increasingly strict fuel economy and emissions standards. Extreme heat, however, can lead to a host of problems, all of which reduce engine performance and life.

Deposits & Sludge

Heat can quickly break down motor oil, creating deposits on the intake valves, which impede airflow into the engine and contribute to poor sealing of the combustion chamber. This can lead to rough idle, misfire and reduced power and fuel economy.

Extreme heat depletes the additives sooner, altering the oil’s chemistry and preventing it from lubricating, cooling and protecting as designed. Sludge can form, which clogs narrow oil passages and prevents oil from reaching vital components, causing wear. Preventing sludge is particularly important in engines that use variable valve timing (VVT). Intricate parts sensitive to sludge can fail to operate properly, resulting in reduced performance.

Testing done by an independent, third-party lab demonstrates AMSOIL Signature Series 5W-30 Synthetic Motor Oil’s superior extreme-heat resistance compared to a leading conventional oil. Signature Series’ superior heat resistance resulted in 81 percent fewer deposits (5 times cleaner) than the conventional oil

Oil Consumption

When oil volatilizes, the lighter molecules evaporate, leaving behind the heavier components. This leads to viscosity increase, which makes the oil more difficult to circulate and reduces fuel efficiency. You may have experienced this when your car “uses” oil and requires frequent top-offs. Volatilization also creates emissions that contribute to air pollution.

If enough motor oil is consumed, eventually there may not be enough to reach all the complex parts of the engine, which can potentially cause damage.

Signature Series Synthetic Motor Oil demonstrated 38 percent less consumption than the conventional oil, reducing frequent top-offs.

The Double-Length Sequence IIIG Engine Test Study offers additional proof of performance. After 200 hours, Signature Series scored 86 percent better for piston deposits compared to industry standards for 100 hours, easily passing the test.

Signature Series’ high-performance additives and quality base oils offer improved resistance to heat, maximizing the performance and life of your engine and keeping it clean.