than how come my moto that is a 125cc lifan engine hasnt died yet(is 4 years old) and im using castrol fully synthetic oil , and my bro has a 125cc lifan and was using the cheap shit and only lasted him about 1 year and then started smokin, and my bike (same engine ) hasnt started smokin yet or the clutch hasnt begun to slip or anything, and when we go ridin his engine heats up like a bitch and mine is still a a low temp and we both dont thrash it or anythin, so there u go, if u use cheap shit u have to replace it every week but if u use the good stuf u only change it once a month,also if u use cheap shit oil like YOU use then the gaskets are more likely to F up as it is slips through and becomes lighter when is hot, Trust me i worked at a moto shop for 3 years and we all used the good oil as the other cheaper oil stuffed new bikes and many custemers came back with oil problems and once we used the castrol r4 or power 1 it went away and there was no more leak so ther u go.