ORIGINAL: Cyclic Hardover
I use 15% Omega (Pink) in every glow I have. I have engines 10 years old and the inside has a slight tan to it.
Yep, if you can't get one of the more advanced synthetics, CP Pink is the best alternative. use it at 18%-20%, tune your engines a few hundred RPMs rich of peak and it'll do the job just fine.
My oldest TT46Pro spent the first 200 hours of its current 400 hours running on fuel blended with CP pink (I then switched to Coopers Plus C at 12% by volume) and it's still running within 300RPMs of a brand new one.