Kawasaki manual and Haynes manual states: Semi-synthetic. 10W-40.
Here is some other info I have gleaned, which needs some clarification.
https://www.bennetts.co.uk/bikesocial/n ... motorcycle
This Bennetts article suggests Ester blend oil is Group V. Anything Group I - III is mineral/semi-synthetic. Group IV up is fully Synthetic. Technically, ester based oils therefore CANNOT be semi-synthetic in the true sense of the wording.
My question is this. How can Fuchs and others be selling Ester based semi-synthetic oil and recommend it for 20+ year old bikes? Even more confusing is that if you go to Fuchs website, there are only 2 semi-synthetic oils listed and the ester based oil is listed/labeled as synthetic.
www.silkolene.com/motorcycle/4-stroke-e ... 10w-40-xp/
www.silkolene.com/motorcycle/4-stroke-e ... ils/#SUPER
