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with a vehicle that old if you've been using conventional oil all its life and are just now switching to a full synthetic, i'd be weary. the synthetic has stuff to clean out your engine, and a lot of times can cause you to start burning oil because the old oil gets buidup around the valve seals and piston rings, and when it gets cleaned out that buildup that was sealing it is not there anymore... in a new vehicle i'd definitely recommend mobil1. in something older, i'd be cautious. keep an eye on it.
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