Speaking as a dealer myself, Opti is the only solution to 2 cycle oil request. I know every brand out there has their own oil, and usually their own mix ratio, so why stock some of everthing? Our customers know us, and trust our opinions. If you are good, your customers will do the same.
I started using Opti 2 cycle 15 yrs ago in our shop. With all the different mix ratios out there, how can a shop justify having a mixed can ready for all of them? Simply put, you can't! Like I said I have used it for 15 yrs and have had "0" problems with it.