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I need to change oil on my truck and I was wondering if Rotella T6 5W-40 is ok to use?
The temperature here changes a lot. I would have to say the range of ambient temperature is 10-40 during nights. It may be anywhere between 30-50 during days.
5w-40 would be optimal over any of the other choices. Same characteristics of 15w-40 when its hot and better cold starting characteristics. Remember the "W" stands for "Winter"....cold starting only is all the first number is for.....after its warm its irrelevant..
I have that same T6 5w40 in my truck. The guy i bought if from always used it in it.
I was always told the first number stood for the weight of oil when cold (somewhere around 60*-70* or so) and the second number stood for the weight when up to normal operating temp. I've never thought to ask what the "W" stands for. Now you got my curiousity up and am going to have to find out.
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