What happens if I put too much oil in my car?

Answer

If too much oil is put into a car, it starts to leak when the engine runs. This leakage is due to excess pressure generated by the oil pump and crankcase placing strain on the seal on the rear main bearing.

If the excess pressure on the seal is not relieved, the seal ruptures, increasing the oil that leaks out. Once the oil begins leaking from a ruptured seal, the oil passes into the clutch and causes more damage to the vehicle. If the problem is still not corrected, the front seal bursts and causes the engine to gush oil. In addition to drowning the clutch in oil, which causes the clutch to slip and malfunction, the excess oil coming through the failed front seal leaks into the engine bay and can be hurled out as far as the front disc brakes. Overfilling the oil also causes the rotating crank to churn the excess oil into a froth. This aerated oil is pushed into the bearings and afterward into the pistons where the piston rings begin to break down from trying to deal with the excess oil and pressure. Excess oil can also work its way into the combustion system and out through the exhaust. By this point the excess oil has potentially caused irreversible damage to the engine.

Q&A Related to "What happens if I put too much oil in my car?"
Too much oil can be just as bad as too little. The excess oil can make contact with the crankshaft and cause cavitation. This will mix air with the oil. This mix creates a froth that
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The mistake that causes engine oil overfilling involves not paying attention to how much oil goes into a car. Most engines only take four quarts of oil, but there is no exact input
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Over filling the engine with oil may be causing the sluggish performance. Try
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Too much oil can build oil pressure & it can blow out your gaskets, cause leaks or kill the engine. report this answer. Updated on Wednesday, February 01 2012 at 04:32PM EST.
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