Just had a quick question about changing the oil in my final drive. The original recommendation is for 90w oil, for use over 40 degrees F. Since I virtually never ride below that temperature, I figure that's the one to go with. Is that still the case? It seems finding straight 90w is a bit difficult - my local dealer only has 80-90w. And should I use partially, or fully synthetic? I've got 21k on the bike, and the owner's manual says change it ever 24k, but the Clymer says every two years, so I'm sort of splitting the difference because I've never changed it and it's been 20 years. Thanks for any replies.
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