What does putting oil in a car, without draining the old oil do?

What does putting oil in a car, without draining the old oil do?
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1 Answer

Answer :

From Tom & Ray: When you overfill the crankcase by a quart or more, then you risk “foaming” the oil. If the oil level gets high enough, the spinning crankshaft can whip the oil up into a froth, like the stuff that sits on top of your cappuccino. And the problem with that is that the oil pump can’t pump froth. It’s like trying to drink from a straw when there’s not much left in the glass—what you get is mostly air. And air can’t lubricate your engine.
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