Thread: Noisy firebird
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Old 12-22-2009, 05:17 PM   #15
edpontiac91
 
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Quote:
Originally Posted by JerzLT1 View Post
change the oil and put some 20w50 in it.
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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