Use only what the manufacture recommends and nothing else.
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.
No, use exactly what Cummins recommends and nothing else.
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.
20W40 or 10 W40 motor oil will do. Some use Yamalube, I just use Wal-mart stuff. The engine is almost indestructible.
According to the Kawasaki site you should use SE class SAE 10W40, 10W50, 20W40 or 20W50 oil for the engine. You use SAE 10W oil for the front fork.
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.
No, you cannot use ordinary car engine oil. Use a JASO MA or MA2 approved oil, or SAE SF or SG graded oil.
10w40 Motorcycle oil
Use 15 W 40 motorcycle engine oil that is JASO MA or MA2 approved.
A XR 600 R Honda motorcycle uses any brand of 10 W 40 motorcycle engine oil. This can be purchased at any cycle shop and also any auto parts store.
almost all motorcycles use a common reservoir for the engine, transmission and even the clutch, so they all use engine oil.
You can use a regular10w-40 motorcycle oil. I personally use Synthetic 75w-90 because I get it for free and like the feeling of the clutch better with that oil. You can also use a regular 80w-90 gear oil but if you are going to change is regularly just use a 10w-40 motorcycle oil.