Penrite oil have come onboard as a sponsor of the DLRA Speedwek Bo, and it's good stuff, Iv'e been using their HPR 50 in the old HD for years, and use HPR 5w40 in the 250, it puts up with methanol pollution rather well, after drowning the 250 with methanol for a mile at full throttle, I drained 300ml more oil out, than I put in !, I saved it in a 2 litre coke plastic bottle and watched it for signs of settling & separation, there is not any,after 3 months ?
No trouble with the wet clutch either, a lot of oils glue the plates together if the bike is let stand for a few days.