happy wanderer
Day Dreaming ...
OK so you bought the bike at 36,200 miles and the final drive went at 37,000 miles. This will be hard for you to believe obviously given your convictions however it probably had nothing to do with the oil and everything to do with incorrect bearing shimming or severely abusive loading or riding. That black puddle you found is from the seal deteriorating after the bearing goes and melts it and very likely not from the oil itself. This is pretty well documented elsewhere. If you had owned the bike since new you would have changed your final drive oil over 14 times at that point. Guess what? It probably would have failed anyway.
It is also dead obvious that despite what you may think you are over doing the service intervals with products not intended for use in your bike by the people who designed it. The forums are great places to learn but a terrible place to preach as I'm sure you've noticed. You should at a minimum consider the advice of those with just as many (or more) years of experience as yourself. Riding and wrenching on cars and bikes for 40 years is nothing special around here, trust me. I have to wonder how much of that experience was just changing fluids?
Even though the best advice here agrees with you that changing the final drive oil more often than recommended is a good idea you are so far beyond that it makes no sense. More really isn't always better. Having cheap access to Amsoil products is no reason to over use them. Maybe save a few quarts for the kids eh?
From the factory manual for YOUR bike:
00 11 229 Changing the oil in the rear wheel drive
(Inspections I, III and IV)
every 40,000 km (24,000 miles) or at the latest every 2 years
? Change the gear oil at operating temperature.
Quantity:
to bottom of thread in oil filler hole
...... approx. 0.25 l (0.44 Imp. pints/0.26 US quarts)
Oil grade for rear wheel drive:
Brand name hypoid-gear lubricant SAE 90 API GL 5
It is also dead obvious that despite what you may think you are over doing the service intervals with products not intended for use in your bike by the people who designed it. The forums are great places to learn but a terrible place to preach as I'm sure you've noticed. You should at a minimum consider the advice of those with just as many (or more) years of experience as yourself. Riding and wrenching on cars and bikes for 40 years is nothing special around here, trust me. I have to wonder how much of that experience was just changing fluids?
Even though the best advice here agrees with you that changing the final drive oil more often than recommended is a good idea you are so far beyond that it makes no sense. More really isn't always better. Having cheap access to Amsoil products is no reason to over use them. Maybe save a few quarts for the kids eh?
From the factory manual for YOUR bike:
00 11 229 Changing the oil in the rear wheel drive
(Inspections I, III and IV)
every 40,000 km (24,000 miles) or at the latest every 2 years
? Change the gear oil at operating temperature.
Quantity:
to bottom of thread in oil filler hole
...... approx. 0.25 l (0.44 Imp. pints/0.26 US quarts)
Oil grade for rear wheel drive:
Brand name hypoid-gear lubricant SAE 90 API GL 5