Figure I would throw this at my oil nerd brothers. I don't like formula + and I don't like the gear oil choices. Looking at what the Pennzoil Synchromesh is comprised of and what it does; Compared to the f+ it looks way better. The gear oils contain too much [censored] that a modern sportster trans and primary doesn't need. No friction modifiers for one. Seems the Pennzoil Synchromesh would work great with the sportsters helical cut gears and the copper and bro0nze stuff should be safer. Any response will be given will be appreciated .