99ebexpedition
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i just hit 125000 miles and ive always used penzoil. but what do you all think i should use. i lose about a quart somewhere.
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talking to a couple mechanics they said i should change my oil weight to 10w30 since its over 125000
that is really old school thought that you need thicker oil as the engine gets more mileage on it. People did that to lessen the smoke from the exhaust. Problem is that thicker oil flows slower. not what i want. Slow moving oil in an older/high mileage engine is a recipe for more trouble. Stay with the same weight oil.