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If it is a diesel: The greater the amount of engine oil in the mix, the more likely it will cause the engine to run poorly. If it is used engine oil, contaminants in the oil will clog the fuel filter which will need to be replaced after the oil is gone.

If it is just a little bit of oil in a gasoline tank: As you drive over bumps the fuel pickup will take some of the oil and burn it along with the gasoline. If you have fuel injection, deposits may form on the fuel injectors which will need to be cleaned to avoid a poor idle or hard starting condition. Deposits may also form on the spark plug electrodes which will need to be cleaned and regapped if they use a single ground electrode or replaced if they use dual or quad ground electrodes. If it is used engine oil, contaminants in the oil will clog the fuel filter which will need to be replaced after the oil is gone.

If it is a considerable amount of oil in a gasoline tank: The oil will tend to be too thick for the fuel pump and it will not pump properly. The oil can also damage the fuel filter and clog carburetor/fuel injectors. The oil will not burn as gasoline normally would so your engine will not run. Your spark plugs will be coated in oil. If you run or try to run the engine long enough you can also get too much oil in the cylinders for the engine to even crank over (hydraulic lock) which could potentially cause physical damage (pieces broken off) to engine components, the transmission, or the starter. All of the oil will have to be removed from the tank, fuel lines, and inside the cylinders and the fuel filter replaced before further damage presents itself.

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Q: What happens to car if there is engine oil in gas tank?
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