It isn't the methanol thats expensive. Thats only $2 or $3 per gallon.

Nitro isn't even all that expensive when you take into considferation that it takes just a few ounces to get 5% in a gallon of fuel.

It's the OIL that usually causes heart attacks when people start adding it up to mix their own fuel. Don't you need somewhere in the neighborhood of 16--20oz of oil to make up a batch with around 15--17% oil?

Obviously, if your only going to run 10% or 12% oil you will be using less. Somewhere around 8oz of oil?

Still--price the oil before you jump in with both feet and start mixing your own fuel. It's not as cheap as people think. Not around here anyways.

I always ran Omega 5% fuel in my big ST engines. It's 17% total oil. It's 70% synthetic and 30% castor. I like that combination in most glow engines, so I decided to run it in my big ST engines too. All I did was run 2 head shims. One .005" and one .008" I ran a generic medium to medium hot plug.

You can get away with running higher oil content if you just shim the head a bit to drop the compression. The higher oil bumps up the already high compression ratio so much, they will start to detonate a bit on long full power runs.

Just slap a couple head shims in there and make life easy on yourself. Buy some regular old stock fuel instead of making life hard and complicated. The extra oil isn't going to hurt your rod bushing. And it's not going to hurt your ring either. Bearings will love ya for it.