What brand does the best ? not sure what was used in this quad , should I drain old stuff and start with new or is it ok to mix brands?
I have a stock 87 lt80 with the injection still working and would like to keep it that way.
Thanks for your help

 

Any oil made for injection is fine. [img]i/expressions/face-icon-small-smile.gif[/img]
Yes you can mix it.