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Synthetics are your best protection to avoiding shear IMO. Riding conditions really determine how often. A cold environment and/or dust/dirt riding conditions would make changin more often a good idea. For me it's every 5K.
I use Redline in all three holes and K&N oil filters at 2500-3000 mile intervals. I usually use a scavenger every 10,000 miles, which usually means once a season. I am sure it's overkill but I am fine with it . . .
No need to do every 5k for primary and tranny unless you have to much money or to much time. Or you enjoy overkilling.
10k for primary, 20k for tranny.
We have a BINGO!
I use Walmart brand 20/50 dino oil in the engine (5K miles) and primary (10K miles). HD filter, and Redline Shock in transmission (20K miles). I have about 22K miles presently on my CVO and it runs like a Swiss watch.
I'm not cheap but am not loose with my money either. If you feel better spending more cash on your ride then needed, more power to you.
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