Re: My oil observations
I don't think it's as much the brand of oil, as it is the weight. The heavy oil can't get squeezed out of the clutch housing as fast as the lighter oil, due to the small number and size of the orifices where the oil is discharged. Allowing plenty of warm-up time heats the oil enough to flow easier.
I used KawChem 20w50 for a couple of years (25,000 miles) in my 95 VN750 and put up with the clutch slippage, even after putting spacer washers on the clutch springs to give them a little extra push. I just ended up with a stiff clutch, but still had clutch slippage during cold weather. Then finally, I switched to KawChem 10w40. Since then, it rarely slips on start-out except in real cold weather when I don't allow a generous warm-up. Some of the slippage now can be from clutch wear for a couple of years.
I've used KawChem 10w40 in my 03 from day one with no clutch slippage in 21,000 miles.
CD in Frederick, OK