It depends upon the nature of the engine installed in that specific mower. Unlike engine mowers, electric lawnmowers give smoother and non-fussy operations. It is not mandatory that all mowers will need oil for their operations. There are some electric mowers also which require direct electricity or battery charging for fulfilling their operations. There is no riding lawnmower in the market which is electricity-powered. Make it sure, all the riding lawnmowers available in the market are gas-powered.