Re: Opti-2 Great stuff!
I'll have to give Opti-2 a try, but for now, I've got a couple quarts of Lucas Synthetic with Benol mixed in at about 20% volume. It smells great and I'm running the called for 50:1 mix that Lucas recommend for modern weedy engines. Seems to work OK as it ran well for 68 miles round trip with out a problem and the engine's carb tuning stayed "locked-in" with no sagging of blubbering.
BTW Klotz Benol uses de-gummed castor oil, it has synthetic oil also.