2 cycle motor oil

i believe they have an oil injection system on these engines

no no no only use 2 cycle oil

No - 2 cycle oil is the only oil you should use in a 2 cycle motor. Because 2 cycle oil is designed to mix with the gas and lube the motor. Your "truck oil" is not the 4 cycle oil will not mix it is designed to just lube in the crank case.

If it is a 2 cycle engine, no, you must use 2 cycle oil. If it is a 4 cycle then use exactly what the manufacture recommends.