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Yes, overfilling can cause smoking, and you need to drain the extra out.
Your biggest problem with overfilling the engine is not damage to the converter but damage to the engine itself. Overfilling causes the crankshaft to make contact with the oil. This will cause a situation where air will be mixed with the oil. This air mixed with the oil causes the oil to lose it's lubricating properties as air is a poor lubricant. This will cause the engine to overheat and will result in severe wear to all moving parts within the engine. If you overfill the engine drain the excess oil out immediately.
Your biggest problem with overfilling the engine is not damage to the converter but damage to the engine itself. Overfilling causes the crankshaft to make contact with the oil. This will cause a situation where air will be mixed with the oil. This air mixed with the oil causes the oil to lose it's lubricating properties as air is a poor lubricant. This will cause the engine to overheat and will result in severe wear to all moving parts within the engine. If you overfill the engine drain the excess oil out immediately.
If your oil pressure gauge is high you have to much oil in your engine. Overfilling your engine can result in you blowing out your gaskets.
Yes, overfilling can damage an engine. Too much oil causes the crankshaft to make contact with the oil and form a froth of oil and air. This froth of oil and air is a poor lubricant and will cause bearing wear.
Overfilling in any car will violently splash oil all over everything and can weaken the piston rings, screwing up your compression and creating some pretty deep and expensive engine work.
Adding 5 quarts of oil to an engine and overfilling it can cause the seals to blow out. This can cause engine failure.
First off, drain it back down to where it should be. Oil leaks can be caused by overfilling the oil.
You could possibilly blow the head on the engine! It will blow black smoke out of the muffle.
Maybe you added too much oil? Overfilling can cause just as many problems as being too low on engine oil. Be sure to check the dipstick after adding oil.
More information needed is it a vehicle, stationary motor, outboard, aircraft engine ? the usual one on cars is overfilling the oil.