HI Friends,
I'm Flying Sebart's Funtana 140 with Mintor 170 and APC 18/8W, alluminium mintor Pipe, I'm USing Coolpower 15 Hely. I have consumed 5 gallons with no one problem carburation, and no one problem of lubrication, ball bearings seems new, for me coolpower 15 is perfect mix for Mintor 170, Coolpower 20 contains too much nitro and the carburation would not be perfect. In Fact Mintor advises one mixture with 10/15 nitro and 15/16 good synthetic oil. Ciao Alfo