Originally Posted by +fireamx

I guess this is as good of thread to ask this question as any.
Does anybody know if a "Chemical Test Strip" exists that you can simply dip it into a container of oil and it will automatically tell you if it's synthetic, or petroleum based?
Or does anybody know of a an "at home" test you can conduct to determine the type of oil you have?
Cross><Hair made a good point when he suggested the dealer may have put the "cheaper" grade of oil in his car.
I would't worry so much about the viscosity as much as I would worry about what type of oil they used.