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Mobil one is a fine oil. I would use the 10W-30 in your turbo. Other quality 100% syn choices include Chevron (avail. a Kragen’s), Valvoline, Pennzoil. If you wan’t true synthetic oil, stick with the stuff that says 100% synthetic, not Full Synthetic. Full Synthetic is the term now used by Castrol in their phony “synthetic” oil. About the best you can buy for your car is the Amsoil stuff. There filters are also the best, if your car doesn’t have a reusable canister. I would do a flush with the Amsoil flush (the other stuff is usually made of harsh solvents, not detergent as in the Amsoil. Good luck.
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1999 S7 T5
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