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It will hydraulic lock. This means that it will appear and feel as if it has siezed up but in fact it probably hasn't. To correct the problem you must drain the excess oil. Start by disconnecting the spark plug wire so the mower can't accidentally start up. Under the mower where the blade is you should find a plug going into the bottom of the motor. Remove that plug and drain the oil. Reinstall the plug and check your oil. fill only to the line on the dipstick. Reinstall the spark plug wire and your mower should start normally.

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Q: What happens if you put too much oil in lawn mower?
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Related questions

What happens when you put oil in the gas tube of a lawn mower?

If all oil the mower will not start. If only a little oil, the mower may start but run rough and smoke very much.


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If the lawn mower is run without oil, the connecting rod bearing will heat and score, or even "weld" to the crankshaft, causing major damage.


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give up and hire a lawn service...


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No for your lawn mower you will just need regular lawn mower oil.


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Drain out the excess. Too much oil will damage the engine.


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