Engine Oil Additives/Supplements

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The manufacturer does not recommend the addition of any engine oil additives/supplements to the specified engine oil. Engine oil additives/supplements should not be used to enhance engine oil performance. Engine oil additives/supplements should not be used to extend engine oil change intervals. No additive is known to be safe for engine durability and can degrade emission components. Additives can contain undesirable materials that harm the long term durability of engines and emission systems by:

Increasing the level of Phosphorus and Sulfur in the engine oil. The API Certified Engine Oils control the Phosphorus and Sulfur contents of the oil to levels that reduce the contamination effect on the vehicle's emission control system.
Altering the viscosity characteristics of the engine oil so that it no longer meets the requirements of the specified viscosity grade.
Creating potential for an undesirable additive compatibility interaction in the engine crankcase. The engine oils contain a performance additive system carefully developed to optimize the oil's performance in the engine. The addition of supplements may cause the oil to thicken prematurely, cause excessive deposit build-up and potentially shorten engine life.