MMO is a water displacing oil great for air tools. I sure don't want any in my MB engines.A good high detergent oil like diesel rated Delo 400 15/40 might help Iv'e been using it in my diesels and my 500 Se quieted down the SE a good bit.I may change to another Dino oil like Castrol now that the Dellos done it's clean up job............

William Rogers.......