The 10% oil and 10% nitro glow fuel you use is often called Fuel for Large Super Tiger Engines. It is sometimes difficult to find in hobby shops, but it is made by all the major fuel manufacturers. I use Byrons myself.

You don't add any extra oil, and you don't use glow fuel with a higher oil content than stated above. Using this fuel at a ratio of 1 part of the glow fuel to two parts of high test gasoline gives you approximately a 32:1 oil ratio, which is fine.

AV8TOR