Yes it is, as long as it also has the designation JASO-AM or AM2, or SAE SF or SG. This specification means that the oil is suitable for motorcycles. There is great difference of opinion among motorcycle drivers as to which kind of mootorcycle oil is best. Don't use ordinary car engine oil in a motorcycle if you can help it and then only for a short period.
Use only what the manufacture recommends and nothing else.
best is 20w40 grade engine oil.
Mixing oil weights is a NO,NO.
You can buy 20w40 oil. Mercursier, Yamalube, Amsoil, and other synthetic oils come in this weight. Or you could just use 10w40 if 20w40 is recommended.
The weight of the oil and flow rate. The 5w30 will flow easier when cold than the 20w40. It is 5 weight oil when cold whereas the other is 20 weight when cold. When the oil reaches full operating temperature the 5w30 is 30 weight oil and the 20w40 is 40 weight.
No, use exactly what Cummins recommends and nothing else.
Yamaha recommends 20W40. You can get some at O'reilly auto parts for sure maybe any parts house. You need to be careful to use motorcycle oil or heavy duty diesel oil in it, not car oil. Motorcycles use the same supply of oil for their engines and their transmissions, so it sees really hard service. Motorcycle oil and heavy duty diesel oil are made for things that chew up the polymers in oil...like motorcycle transmissions.
SAE 10w30 is better for lower temp and SAE 20w40 is the opposite better hotter temps.Thanks
20W40 or 10 W40 motor oil will do. Some use Yamalube, I just use Wal-mart stuff. The engine is almost indestructible.
Engine oil capacity is 2.6 quarts.
Motorcycle oil
They can range greatly from 5W30 to 10W30 to 20W40 to 20W50, depending on the application, engine type, driving conditions. Best to check OEM specs