Join Date: Apr 2017
Location: Green Valley, Arizona
Well use the 10W-40 but consider an early change again. I don't have a Service Manual for the 286 cc engine, so I can't check the oil pressure, but, I will bet that it is similar. I was worried about getting good top end lubrication with higher viscosity oils. That was never a problem with the old air-cooled stuff (much bigger tolerances) but the modern water-cooled engines run very tight specs and prolonged use of higher than spec viscosity oil might cause a problem. Why take a chance? Have them order it in with their regular shipments.
The Rotella will not have energy conserving additives. Standard automotive oils will have have those additives. I do not think that moly is used anymore, but that was the bugaboo 25 years ago; moly can lead to clutch failures for bikes like ours, where the engine and transmission share the same oil.
John '14CB500XA (Daily Rider), '09CRF230L (Li'l Red Piglet), '89NX250 (sold), '01Rebel250(sold)
Propelled by Penguin Power
Nekkid motorcycles feel faster
1st bike: a gently used 1958 Matchless 250 thumper
Last edited by jsonder; 05-20-2017 at 11:41 PM.
Reason: add historical stuff on Mo