I am using Loncin GP250, 250cc oil Cooled engine. After 500km run, I used motul 20/40 engine oil. Problem is, engine is heating too much. Question is what is the recommended engine oil grade for 250cc oil cooled engine. Thanks
I would try to figure out why it is overheating before getting a new oil. Though I don't see a Motul 20w-40 on their product page, I assume you are at least using motorcycle oil?
What kind of temp ranges are getting and what is the climate.
Oil choice in Alaska is going to be a lot different that Dubai.