On the 28th of november while out moose hunting here in Alberta Canada , it was -29c my viking i had just bought 28 days before on the fist day of Nov , blew the dipstick out and all the oil as well. , did not smell the oil or hear when the dipstick come out . Needless to say my motor is toast !! Wondering if anyone else has had problems ,, not sure what caused the preasure beside something freezing up we was driving in just over a foot of snow and only doing about 15 to 20 mph ,, yamaha says there is no way the crank case preasure got that high to pop out dipstick !! But something caused it too !!