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Old 06-09-2007, 06:33 PM   #9
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Join Date: Jan 2004
Location: SW Florida
Posts: 893

2009 VUE Red Line
Default Re: Rotella T Engine Oil....

Originally Posted by 97coupe View Post
Actually there is no 40W rating. It is 40 weight or 40 SAE or API. The "W" after the number stands for it passing the winter test rating not weight like 0w20, 5w30, 10w30 and 15w40. I know of no winter test rating for 40 weight. This is why you also never see a 30W or 40w on a straight weight can or bottle but you can on 10 or 20 like 20W20. (never seen straight 5 but they might make it)
What is 20W-50 then? I would presume it acts like 50W at high temp which is different then 40W at high temp and 30W etc.


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