My Dad always told me use the cheapest two stroke oil out there because it will burn up and leave no residue. Being a 14 year old at the time I listened to him and ran Kmart two stroke oil in my 1978 KX125. Nothing bad happened and it was alot cheaper to running a allowance than Belray MC1+. Being a adult now, I question that but the truth is as long as you are running oil a decent ratio it will be fine. I ll never be sold on 100:1 ratios, anything more than 50:1 is crazy in my book. That's my opinion.