What happens when you put 2 stroke fuel in a 4 stroke engine?
Simply so, what happens if you put 4 stroke fuel in a 2 stroke engine?
2 Answers. There is quite the extreme possibility there has been permanent damage done. 4 cycle engines do not need oil mixed with the gas to provide lubrication, since it has oil in the crankcase. Two cycle engines have to have oil mixed in the gas to provide the lubrication needed, since there is no oil in the sump.
Similarly, it is asked, what happens when you put mixed gas in a four stroke?
On a four-cycle lawnmower engine, the oil and gas go into separate areas of the motor. If you accidentally pour oil into the gas tank, it will not damage the mower if you drain it and replace it with gas. Any oil left in the gas tank burns through the exhaust, so it may be smoky until it burns off.
Two-cycle engines use a mixture of oil & gasoline in a single fuel tank. Four-cycle engines do not require mixing of oil & gasoline and have separate gasoline and oil tanks. Look for stickers labeling the equipment (e.g., "Four Cycle" or "No Fuel Mixing"). Look for an engine oil fill cap.