Originally posted by mmurray75
You can get high octane unleaded race fuel. I would use that instead of the leaded stuff. Don't risk the O2 sensor and cats they are very pricey to replace.
Running a mixture of leaded gas with unleaded will cause problems with the O2 sensors, although a small mixture (25%) doesn't ususally cause permanent damage.... However the cats do not respond well at all, and may be significantly damaged by such mixtures.. I have run pure leaded, but removed the O2s and Cats.
The other option, which I also do sometimes, is either get unleaded race gas, or mix Toluene (20%).