Quote:
Originally Posted by jason490
Good points,
I can tell you of a guy I knew that was a certified mechanic and a die hard quaker state user until one day. His beloved 65 corvette needed a new intake gasket. Upon removal of the intake, the oil valley was so full of sludge you could not see the lifters or hardly the pushrods. This was all from quaker state. I know some of you will say "how often did he change his oil, etc." This guy was a stickler and the corvette was mint. So that oil blows plain and simple. Have they changed it over the years? Maybe, but I would still stay away from it. If you cannot afford good oil like mobil 1, then you probably don't need a mercedes.
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Mercedes spends billions of dollars researching what to use or recomened on their mercedes for a long life. I'm sure the dealer recommened QS 15W40 is no mistake on dino cars as they would have advisory of which oils not to let a mercedes touch.
Mercedes takes years and spends billions to research this stuff, not your 2 cents...