Originally posted by Ergo60
OK, first run a fuel that is all synthetic. The brown spots are from the castor oil, and if the fuel has any in it the brown spots will come back.
I know that, which is one of the reasons why I am switching to YS 20/20. All synthetic 20% oil with 20% nitro.
The 15% was about half a gallon that I needed to finish up. Looking back on it, maybe I should have just used it in my planes.
Thanks for the tip on the cleaner. Is this the correct name
'automativew wheel polish'?