Any xxW-40 oil is thicker than a 30 grade oil and thinner than a 50 weight oil at 100 degree C. The number before W shows at what ambient temperature it is suitable for cold start. Here 10W means that it is suitable for cold starts up to minus 18 degree C and 20W means that up to 0 degree C.
In our country where the ambient temperature seldom reaches 0 degree C, the W number is not at all relevant.
Now the oil you are using is thinner than what is recommended by the manufacturer. So, replace it with any xxW-40 mineral, SS or synthetic oil. The semi synthetic or synthetic oil does not affect the proper running in of the bike if it is not yet over.
Buy the oil and oil filter and replace it yourself. Replace the oil filter as it is not sure the mechanic has replaced it while servicing.






Comment