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You are full of it. Several CEGr's have posted lab test results on Mobil 1 going over 10,000 miles with life to spare. The ONLY way to accurately estimate how long of a drain interval to use is with an oil analysis. Too dark??



I only know what I have directly experienced with oil. My family's short trip driving tends to make the oil dirty fast. The oil drained out at 6000 miles usually almost resembles driveway sealer, consistent with several cars (Mystiques,Dodge Lancer,Mercury Sable). My father's Avalon could go longer, easier driving and tighter engine (low miles on it). Maybe I could get oil analysis the next drain of dark smelly oil, I wonder if it would pass? Who's a good lab for that? The Mobil 1 does seem to keep my wrenches away from the inside of the engines, so I am happy with its performance. I even use it in small (mower, snowblower) engines, easier to start and they run a bit cooler, use less oil.