Because of this, you need to mix oil (the lubricant) with fuel before putting it in a 2 stroke engine—otherwise, the engine will seize up. In a 4 stroke engine, air and fuel (and the combustion ...

The power stroke extracts work from these gases as they expand and force the piston to BDC. In the exhaust stroke, the exhaust valve is open and the combustion products are expelled from the cylinder.

The best thing i want to say is use only car dedicated 20w50 engine oil and se the result ... engines of cars which is similar to four stroke bikes .. there no need to worry about ...