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My grandmother was told by her mechanic, and confirmed with the dealership, that her engine oil needs an additive. It's a '94 Cadillac Deville with I think over 150,000 miles on the engine (not the original engine). I think what she does is instead of putting however many quarts of oil it needs, she uses 1 less and puts 1 quart of some special additive-y oil in it. I think... I'll ask her next time I see her.
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