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As with any car, it depends on how much extra oil is added. If enough extra oil is added, the oil level will reach the crankshaft throws (i.e. piston rod connections), and get whipped up into a froth (like a latte) as air is mixed in with the oil. If the froth gets sucked in by the oil pump for circulation through the engine, the surfaces that are normally lubricated by constant film of oil may instead have air injected on their surfaces. This is not a good thing. It's almost the same as having too little oil. If you think you put in too much oil, and you see a lot of foam on the dipstick afterwards, you may have to drain some of the oil out.

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Q: What happens if engine oil is overfilled?
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What happens if you add too much oil to your engine and drive?

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