I am presently blending with 10:1 ratio using Quaker State - Small Engines - 2 Cycle Universal Engine Oil (For Air-Cooled Engines).
The quart bottle specifies on the back the following info:
Quaker State 2 cycle Universal Engine Oil is a premium formulation fully compatible with low octane, oxygenated/gasoline fuels.
Provides outstanding anti-scuff, anti-wear, rust and corrosion protection.'
Helps keeps ports clean for maximUm output.

BTW. The ratios recommended for oil in the glow converted engines like Super Tiger G.90, 2300 (1.4) or O.S. 1.08 seem to vary a lot from anywhere between 8% to 15% depending who you speak to.

For example, I origionalLy had decided to purchase the Pro Spark Ignition system, until I read a post at RCU wher a guy installed 6 systems and strongly recommended the C.H. Ignition over the Pro Spark. (Better Transition).

Now the Pro Spark Ignition recommends 15:1 whereas the C.H. Ignition recommends 10:1.
I have personally seem post of various ignition users as low as 8:1, or 12:1 etc.

Nelson HobbY website use to sell the Pro Spark & there is a photo of a O.S. 1.08 which has run for 150 hours using 15:1 with no sign of wear. Gerry Yarrish back in 1999 MAN mag ran a review of the Pro Spark Ignition and he used Havoline 2 cycle oil at 15:1.

I origionally broke my SuperTiger G.90 as a glow with methanol/5% Nitro for about 35 minutes before converting to Ignition.
Then started with 10:1 After its fully broken in I will move to 12:1 then later to 15:1.

DDriver.