Quote:
Originally Posted by edpontiac91
VERY DUMB idea in the middle of Winter! You need a 5W or 10W bottom number in order to turn the motor over on very cold (-20) mornings. A 20W 50 will be much too thick to quickly get moving and will put a lot a strain on the battery. A much better oil would be a Synthetic 5W 30 for the Winter and then switch to a 10W 40 in the summer if you have some valve noise.
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Not if you run a good synthetic - they should flow freely at much lower temps than pet. based oil, regardless of the viscosity.
- Justin