2012 Pro RMK 800, 1400 miles. No problems so far. Tested compression last month, 660 feet altitude, cold, 135 on my gauge. Turned the oiler up within the first 100 miles, and ran oil in the gas that first winter. It has had maybe 4-5 tanks of 91 octane no ethanol run through it, otherwise it has been 87 octane with 10% ethanol. Hope it makes it through this winter.