Is it OK to slightly overfill engine oil?
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TOM: It’s unlikely, Will.
It’s true that overfilling the crankcase with oil can damage the engine.
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..
What happens if you overfill your oil?
When too much oil is added, the level in the oil pan becomes too high. That allows a fast-moving lobed rod called the crankshaft to come into contact with the oil and essentially aerate it. The result is a foamy, frothy substance that cannot properly lubricate the engine.
What happens if you overfill your oil by half a quart?
In any case, it’s nothing to worry about. An extra half a quart of oil in your crankcase is not going to do any harm to the engine. If the crankcase were seriously overfilled — say, more than a quart — then the spinning crankshaft could come into contact with the liquid oil, and churn it up.
Can I drive my car if I put too much oil in it?
Can I drive my car if I added too much oil? Yes, you can, but keep in mind that the chances of causing significant damage to your vehicle increase if you are using it frequently after an oil overfill.