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 OilClearcoat Repair Specifications - 3M Products Emblems/Decals/Paint
Clearcoat Repair Specifications - 3M ProductsPaint ConditionWet SandingScratch RefinementCompoundingRotary PolisherDual Action Orbital PolisherHand Glazing/ PolishingNew vehicle prep or fine wheel marks————Perfect-It 3000 Swirl Mark Remover P/N 06064Perfect-It Foam Polishing Pad P/N 05725/38 ...