11-17-2017, 11:01 PM
(11-17-2017, 02:26 PM)Flynrider_imp Wrote: SportsterDoc,
If you're riding in very high temps, I'd recommend switching to a synthetic. The combination of high temps and an air cooled engine can be very tough on dino oil. Add to that the shear factor from the oil circulating through the transmission gears and you're asking a lot from a multigrade dino oil.
Several years ago I started doing oil analysis on my bikes and found that summer time riding temps ( up to 115F) were having a bad effect on my favorite multigrade dino oil. The viscosity was down to a straight 20 weight after only 2000 miles.
I ended up switching both bikes to synthetic oil. Subsequent oil analysis showed that it was holding up well beyond 3500 miles of summer time riding. Well worth the extra few bucks!
I use Shell Rotella T6 (5w-40) in both bikes now. It meets the JASO-MA spec required by Honda and is only around $21/gal at Wally World.
My favorite also because it works and it's cheap.