Depends on how long you ran the engine after over filling the crankcase with oil. If you did not run it, remove the drain plug for a moment and let some oil drain out to the correct level, No Harm!
If you olny ran the enging briefly, drain some oil out, again no harm.
If you ran the enging for a longer period of time, the crank shaft and the connecting rods could have been dipping into the oil in the oil pan and whipping it into a froth. You should be able to see this by looking at the oil on the dipstick. If the oil looks brown and frothy you may have caused serious damage to the connecting rod or main bearings on the crank shaft. (Oil is a great lubricant, but the air whipped into the oil is no lubricant at all!)
If the last case is yours, drain all the oil and froth out of the crankcase, change the oil and filter again, drive the car for about 100 miles, and change oil and filter again. If you damaged the bearings you will see the shavings of metal in the oil when you drain the crankcase. It will look like very fine grains of shiney sand in the bottom of the pan you drained the oil into, so be sure to use a very clean pan to drin the oil into.
If the bearins are damaged severly, you will hear a rapid ticking noise when the engine is running, that will increase in tempo with the engine speed.
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Monday, July 5th, 2010 AT 7:45 PM