OS recommends 18% but that's way too much in my opinion. I like my 12% blend with 25% nitro. Runs good doesn't get hot you just have a bit of castor goo but I know how to clean that so not an issue.
Ah, yes! Good that you did mention that, now I remember another very stupid discussion with this guy.
https://www.rctech.net/forum/offroad...ubleshoot.html