Quote:
Originally Posted by MikeVillages
Thank you, I wondered why yamaha does not recommend synthetic oil. What about Super Tech Full Synthetic SAE 10W-30 4-Stroke ATV Motor Oil which is what I used when I changed the oil? It is a little expensive but only 1qt is required.
PS
I sent the old oil for a UOA (Used Oil Analysis) and will post the results here.
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Saturated "synthetic" oils have lower lubricity and miscibility than a scrubbed oil but I don't know why they state not to use synthetic oil. That oil is fine but a straight SAE 30 (This is Florida - not Minnesota) would have no VII rubber to breakdown. ILSAC oils have too low HTHS and do not have proper EP wear additives so use a 4-stroke oil designed for high heat/high stress. There is nothing more stressful than a golf cart engine at startup from a complete stop...You can just hear that metal slapping
No big deal...Just change oil on time is key.