Well i bought the Shell Rotella T5 oil which is synthetic blend but is not JASO Ma certified, but some just get the t4 I believe and the t6 and blend it which both are Jaso MA certified I believe I am saying that correctly, You just dont want Friction inhibitars in the oil? Don't quote me on all this I just know these wet clutches need certain oils and others is just a big no no. The last time I bought oil I was forced to get Motorcycle Quick Silver brand.... I at the time was unaware of using Diesel oil in our bikes. But is alot cheaper option i believe I paid 25 for a gallon of *motorcycle Oil*