Whale oil?! If that wasn't coming from you Chuck I'd think you were pulling my leg. But, I never owned a Japanese bike until the early '80s. On the flip side, I can second what Charlie D wrote. I've been running ATF in my HDs and this VTX for a long time. Over 100,000 miles on the X. 2 front end rebuilds. 1st was cause of leaking seal (around 35,000 miles), replaced whatever Honda put in there with ATF. 2nd time was just PM (around 80,000 miles) but did replace bushings/seals,etc., filled with ATF again.
Jimbo. 1800c, Drag Bars, Drag Pipes, Chrome Wheels, 31T Ring Gear, BadX Extreme Seat, SOTMC Shocks, 200 Rear Tire, Elimination of all Non-essentials, Kingdom of Kicks.