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I do a lot of mechanical work, for a DIY'er. In the last two engines that I've been into the oil scraper rings were locked in place by carbonized oil (one Dodge 3.9 liter six cylinder, and one 3 liter Mitsubishi, both more than ten years old, and both with near 200K miles). Wear was not bad in...

I have a 1994 Mercury Grand Marquis, engine has about 98000 miles, runs great, gasoline mileage normal, normal in every way, except oil mileage. If I use 10w-30, as recommended, mileage is about 1000 miles per quart, about 1200+/- miles with 15w-40. Ford says that this level of oil consumption...