One might want to be a little cautious!! If the snow builds up around the crankcase, the oil may thicken, the great splash may not occur inside, very cold temps might also cause this, the block may not get lubed right, if the motor wants to act sluggish it maybe drying out inside, stand still and let the motor warm up some, lost a good Tec that way a long time ago, it is also wise to have 10w40 weight oil in crankcase in extreem cold temps, 30 wt, is way too thick.
dave