cadillacsevillests92 Posted February 24, 2005 Report Share Posted February 24, 2005 Hello everyone Im Big Fink, I really need some help tryin' to figure out what kinda motor oil I wanna swich too. since i have over 180k miles im switchin' all my fluids to High Millage. I was lookin' into Castrol High Milleage,does anybody use it and if you do could you tell me if it is any good? Ok the real ? is would it work if i swich from 10w30 to 10w40 motor oil? how about sythetic motor oil. i got the 4.9L Engine and I wasnt sure so I figured this whould be the best place for me to find out yall help'd me out incredbly last time I posted Please help me agian. Link to comment Share on other sites More sharing options...
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