Some 2-stroke gasoline engines use an oil injection system.
This system doesn’t need the oil and gasoline mixed manually. An engine-driven oil pump takes oil from a tank and pumps a measured amount directly into the engine where it will mix with the fuel and lubricate the internal engine parts. The pump delivers the correct amount of oil for the engine speed and the throttle setting, which makes it a more precise system than running the engine on a fixed oil-gasoline mixture.
