When you hit the throttle briefly and a lot of smoke comes out it is usually an indication of blow-by.If you remove the oil fill cap and it looks like a milkshake that has a melted,this is caused by moisture in the air in really cold weather.It could also could come out the vent tubes in small amounts,this is normal and I've seen it for years on good engines.This will go away when it warms up again.
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