It's a Yamaha so it'll call for yamalube but I have one just like it and I use Honda tranny oil and I have no problems with it and its about $3 cheaper but it root depends on how aggressive u r on it me I drive mine like its a 4 stroke and have had the same plug for 13 years but if u want it to stay all factory I recommend using yamalube Yamaha designs the bike so they no exactly what is the best for it so it'll b dependable at last
SAE10w30 Synthetic
Hypoid 80/90W. Check www.xjbikes.com
oil injected
That is the burnt two stroke oil. it is pretty normal
2.5 qts
SAE 10w30 oil or Yamaha 4 Stroke Engine Oil
5000 gallons
10-40 synthetic Suzuki oil
the answer is on the inside of the cover plate on the left side (sitting on the bike)cover the triangular cover. I have a 1982 Yamaha xj750j and it says sae 20w/40(above 5 c)sae 10w/30 (below 15c)
Yamaha's Yamalube, 2 stroke oil is a good choice.
sw 30
Yamaha's Yamalube, 2 stroke oil should work pretty good