You've got to avoid those evil "Energy Conserving Oils" on motorcycles, mostly because the additives will play a number on the wet clutch. There are also some people that argue that the transmission "chews" up the oil and that is why motorcycles require more expensive motorcycle specific oil. I'm happy with diesel HDMOs on my bikes, but I went shopping for 1 quart of oil for the scooter and... The engine on the scooter doesn't have a wet clutch, nor a tranmission to lubricate, it's just the engine... Just like in a car. My scooter is my commuter/grocery getter, she sees a lot of cold startups and doesn't get to run very far that often. Manual calls for 10W-40 oil, which is unobtainable here, closest I can get is 15W-40. But what if I went with 5W-30 oil? It's energy conserving, which shouldn't be a problem for the scooter, it will be thinner for those cold startups, and maybe free up 0.001hp :eek1 First oil change at 500kms will be done with regular, and cheap, 15W-40 dinosaur oil (Wally's World Super Tech), it should only last for 500kms. Break in should be complete by the next oil change and first service, at 1000kms, I'm thinking maybe trying 5W-30 on that oil change. What do ADV Battle Scooter Riders think abou 5W-30 oil on a scooter?