This continued agrument is why I switched from Mobil 1 to Castrol 20-50W V-Twin syn in the crankcase. It's always available in my area, consideraly cheaper than M1 and Castrol has been making motorcycle oils for a long time. Motor runs cooler and top end is not as noisy.

 

Will be changing the three holes as autumn and cooler weather are upon us and will be going with Redline Shockproof for the Tranny in my RKC 103, Redline MTL in the primary and had already Redline 20W-50 ready to go for the engine.

My local Advanced Auto has the newer, light grey colored quarts of Mobil 20W-50 V-Twin and the manager there sold me five quarts of the V-Twin plus a top of the line Bosch Extended drain filter for thirty five bucks!

I'll use the Harley OEM filter that I have on hand for the RKC and the Bosch filter for the 4Runner V8.

I'll use the Redline 20W-50 next spring/early summer for the Harley Engine oil change.

Five bucks a quart for the Mobil V-Twin!

Maybe your Advanced Auto will give you a deal as they're moving a lot of Mobil Synthetic Oil in this month's 'special'.