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 OilAdditional Maintenance and Care
Your vehicle is an important investment and caring for it properly may help to avoidfuture costly repairs. To maintain vehicle performance, additional maintenance servicesmay be required.It is recommended that your dealer perform these services — their trained dealer techniciansknow your vehicle b ...