Do not add anything to the oil. The recommended oils meeting the dexos specification are all that is needed for good performance and engine protection.
Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.
Selecting the Right Engine Oil
(Diesel Engines)
What to Do with Used OilAir Conditioning Evaporator Core Replacement Evaporator
Air Conditioning Evaporator Core ReplacementCalloutComponent NamePreliminary ProceduresRemove the thermal expansion valve. Refer toAir Conditioning Evaporator Thermal Expansion Valve Hose ReplacementRemove the heater and air conditioning evaporator and blowermodule. Refer toHeater and Air Conditioni ...