Well, I can't imagine on a Asian-designed, shaft-drive bike which means the engine basically has a right-angle bevel-gear drive assembly (think rear differential on a car) plus the transmission gears all sharing the same oil as the engine which has plain crank bearings, flat tappet valve shim buckets, long cam timing chains, slipper pistons, dual counter-balancers, Hi-Vo jack chains NOT being magnitudes harder on their oil than other domestic m/c engines and yet live extremely long lives (100,000+ miles) using conventional 10w-40 oil changed at 7500 mile OCIs and filter changed every other OCI?
Knowing this information, and knowing the mechanical make-up of an HD TC engine, why is anyone (in their right mind) recommending RL or M1 and 2000 miles OCIs on these bikes?
Answer: ?????? IDK
I have repeatedly pointed this out and repeatedly have been shouted down as a Harley "hater" and some kind of malcontent. Yes, I know that everyone is "free" to use any kind of oil they want, but it doesn't mean it is wise, prudent, or economically/ecologically viable. And we should be able to offer a dissenting viewpoint in a reasonable and logical manner and not be "demonized."