Actually I cannot help but agree with you re varnish, it seems to be more related to humidity than anything, and Brisbane has humidity by the bucketful. I personally noticed an alarming increase in varnish with my Cox reedies when I went from 15% nitro to 25%. I must admit though, many other variables were at play, i.e. new engine and humid day. One engine was not new though and was squeaky clean to start with. Bizarre.

My apologies if I appeared to direct the nitro comment to you Luna, I didn't really mean it that way. I have had recent dealings with an individual who insisted that nitro carries heat away and I can't seem to convince him otherwise. It can if the engine is running burbling rich I guess, but that that would defeat the point of running nitro. It's all cool matey!