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 OilEngine Front Cover and Oil Pump Installation Engine Block Cylinder Block Cyl Block Front Cover
Install the engine front cover-(1) with a newgasket-(2).Caution:Refer toFastener Caution.Note:The center bolt-(1) should be tightenedlast.Install the engine front cover bolts and tighten to25-Y-(18-lb-ft).Install the long water pump bolt-(1) and tightento25-Y-(18-lb-ft).Install the accessory drive b ...