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Mobil One full synthetic is by far the best motor oil available - but not neccessarily for fuel efficiency. The breakdown resistance and engine longevity are the better (Consumer Reports magazine). Mobil One is one of the few PAO oils around (Royal Purple and Amsoil are others, more but I can't remember), but the cobalt (or cadmium - I can't remember that either) compound greatly decreases engine wear (Motor Cyclist magazine test).
For something I can remember, Mobil One full synthetic gained me over a full mpg just by switching oils, and not the thin stuff, either. The Fram Toughguard oil filter is my recommendation for oil filters, but only based on filtering ability.
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