Too cold is not a good problem. Too high a viscosity + the inability to boil off water contamination = bad news. Excessive wear due to too high a viscosity, oil pump wear, no boiling off of water contamination, corrosion, etc. Synthetics and multi-viscosity oils do help, but maintaining a proper operational oil temperature is the best way to insure long engine life. 180* is nothing for a motor oil.
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