ORIGINAL: RTK
Doesn't matter what engine you are flying, I would personally stay away form the 100:1 ratios. More oil=more power and protection from all the reports I have read. Find a good quality oil (synt or non-synt) that is recommended by the manufacturer to be mixed in the range of 32-50 to 1
Over heating usually comes from incorrect adjusted needles and/or poor cooling.
Ditto.
Pick a good oil thats designed to run at 32: or 40:1 or 50:1. The back of the bottle will have a chart to tell you what the recommended ratio is. Follow those recommendations on the oil bottle and you will be fine.
You probably know this, but DON'T get oil thats designed for a jet ski or boat motor. Those oils are for water cooled engines and will not work in our air cooled engines.
I wouldn't run 100:1 in an engine under any circumstances. Does a shot glass of oil in a whole gallon of gas seam like enough oil to you? Most shot glasses are 1oz to the line and 1.25oz to the very top. So, 100:1 is just about the equivelant of filling a shot glass to the rim and dribbling that in your gas. Thats nuts IMO.
It really doesn't make any difference what oil you run. Find any decent brand oil and stick to it. I just happen to run Husqvarna chainsaw oil mixed at 40:1 in all my engines. It's 1/2 dinosaurs and 1/2 synthetic. Seams to be a good oil and it's readily available at most big box stores. I buy mine online by the gallon from Norwalk Power Equipment. It has charts for 32:1 or 40:1` and 50:1. I mix 40:1 with it. I recently pulled the muffler and plug from a G-62 with 8 gallons of that mix run through it. The piston had one tiny spot of soft carbon--oil smudge--. It was about the size of a nickel. It rubbed off with my pinky finger through the exhaust port. The ring grooves look clean as a whistle. Rings are free-floating. There is some light tanning on top of the piston and the side of the piston between the first and second rings. Below the second ring it is as shiny as the day it left the factory with no signs of skirt scuffing.
(a sign of poor or insufficient oil)
That doesn't mean Husky oil is the best oil in the world. Just pick ANY quality oil and run it according to the directions on the oil bottle.
I'll bet ya dollars to donuts you'll crash that engine LONG before you ever wear it out. Thats what happens to most engines. It's a rare pilot that can run an engine for 2000--2500hrs without crashing it. 95% of our airplane engines meet an early death in a collision with the dirt or a fence post.