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Re: Synthetic Oil
I switched over to synthetic within a couple of months after buying our van in 2005 (it had about 92k miles) and haven't seen any adverse effects. I kept the same viscosity (5w30). Gas mileage hasn't changed either.
I run synthetic oil in all my vehicles.
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1998 Venture LS
2001 Silverado 2500HD, LT
1990 Cavalier
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