i have ran my evinrude intruder and my 200 johnson in cold temps like that,it will still pick up the oil.the problem is that you may have water in your oil tank
it will freeze up.i would dump the tank, clean it out blow out the lines and refill,a said in the post before if you run it long you could have scored your cylender walls and damged the rings and bearings,you can get a pin lite and peek in the cylender through the plug hole,the scars usually start at the exhaust port.