This subject has been kicked all over the world but it's always good for a full thread.

Personally, there is not an oil made that I would run at 100-1, regardless of the manufacturers statements. If the oil is that great, why don't all the full scale aircraft manufacturers, the FAA, and auto engine manufacturers recommend it, at any ratio? Is the manufacturer going to replace your plane or engine when the engine fails due to a siezed bearing or melted piston? I seriously doubt it. Is`the dealer rep for that product going to be there for you when the ca-ca hits the fan? You know he's not.

Most r/c engine manufacturers do not test their engines to destruction. Only a few more test their engines with run times in excess of a few hundred hours. You can be assured that an engine using a quality two stroke oil designed for air cooled engines, with ratios from 40 to 70-1 will last as long as you would desire if you don't crash it. 500 to 1,000 hours is not an unreasonable engine lifesapn before rebuild if they are kept clean and lubricated.

Oil serves three purposes in an engine, with a fourth as a side issue. The primary three are lubricating, cooling, and cleaning. The fourth is actually a by product of the mix ratio. Oil mixes actually lean the gas/air mixture, often changing a fuel/air ratio from the standard 14.7-1 to in the area 16-1.