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Old 02-26-2010, 01:18 PM   #1 (permalink)
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5W-40 T6 Rotella

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.

I usually use Rotella 15W-40... what's your take??
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Old 02-26-2010, 04:22 PM   #2 (permalink)
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owner manual recommands 15w40 10 degrees F and up
10w30 30 degress F and down
and from 0 degress down 10w30 with block heater
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Old 02-26-2010, 04:36 PM   #3 (permalink)
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I ran it in subzero temps around -5 to -10. Did good for me, and I'm still running it. I even noticed when I switched from the 15w to the 5w I quit burning a quart or two between oil changes.
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Old 02-26-2010, 05:48 PM   #4 (permalink)
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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.
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Old 02-26-2010, 08:05 PM   #5 (permalink)
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I always thought the 'W' stood for weight.
Certainly wouldn't think 75w160 gear oil would be a winter oil.
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Old 02-26-2010, 09:00 PM   #6 (permalink)
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Ah, goody so I wouldn't be doing any harm if I switched to T6 eh?

Wouldn't I be making my truck unhappy if I switched oils every "season"? winter/summer?
Any issues of gunk build up or anything like that? I change oil near religiously considering I do it myself.

Thanks for your help so far!
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Old 02-27-2010, 06:57 AM   #7 (permalink)
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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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