Ya know... I just love it when I read all of the rationalizations of why some people use such and such oil for one engine and another for another. Another thing that burns me up is this break-in thing. Christ folks... these are chainsaw and weedeater engines. 2-cycle gasoline! They need a break-in run like a bullfrog needs shock absorbers. LOL

Just pick a good, brand-name oil that's readily available in your area and mix it at 50-75:1 depending on the OIL MANUFACTURER'S recommendations and just USE IT. Tune your carbs on the same oil for all your engines and find something else to worry about. You will have long since destroyed either your plane, your engine, or BOTH before this methodology fails you. Trust me.

I was raised in a garage and body-shop and never got the grease off my hands until I turned 16 and realized that girls didn't find this very appealing on date night. LOL My daddy's been a professional mechanic for 45 years and he'll tell you EXACTLY the same things I said above.

I will defer to RCIGN and what he has to say or at least I won't argue with him. Other than him, I'm pretty sure I know about as much about internal combustion engines as anybody else on this board.

It's amazing how anal folks around here get about things like oil and gas mixtures. Why do engine manufacturers make these recommendations then for break-in routines and ratios and such? I'll tell you why. One word. Warranties. It's a chainsaw motor folks! When was the last time you saw a break-in instruction in a chainsaw manual?!?!? LOL

This rant is not directed at the original poster or anyone else in this thread. I just had to get this all off my chest. People worry themselves to death about oil:gas ratios and break-ins and such on gasoline engines and then put $0.50 servos in these planes. Find something worthy of worrying about BESIDES what kind of oil to use.

End rant.