I've been using Pennzoil SAE-40 in my Intruder Motorcycle for 40K miles. No problems. However, it's getting REALLY hard to find. But, the local Kragen does carry conventional Valvoline SAE-40. I do know that several of Valvoline automotive oils, including their synthetic, racing and conventional multi-grades in the higher viscosities warn against use in motorcycles with wet clutches. What I haven't been able to find is anything that warns AGAINST the use of their mono-grade SAE-40 in a wet-clutch motorcycle. Before I put the oil in my motorcycle, can anyone tell me that the same admonition holds true for the basic conventional SAE-40, or is it OK to use in a wet-clutch motorcycle?