dont know where the info about formula+ being the same as gear fluid came from, but it is for sure not the same.
i switched from formula+ to gear oil to try it and i ended up with some serious clutch shutter up on the mountain. switched back that night back on the mountain and shutter was gone. they are not the same. 20w50 engine oil and gear oil 80w90 are about the same viscosity, this is because gear oil is tested an rated differently than engine oil. but regardless. clutches go bad, coulda been from last time it slipped glazed the clutches and has rapidly worn cause of that. my clutch is on its way out as well 25K i think cause i miss adjusted it and glazed them on a 1200 miles trip