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Audi A4 Synthetic Oil?
My first change is at 5000, but I need to add some oil before this interval.
Is it ok to mix regular and synthetic and when the oil change interval comes around will it be fine to put regular in the car? I have heard many stories about once you go synthetic you can't go back, is this true and if so why not?
Anyone else have the dealor tell them that their A4 came with synthetic? Is there anyway to tell if it is really sythetic?