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15w40, 10w30, 10w40, 5w40?

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Old 06-05-2007, 11:04 PM
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15w40, 10w30, 10w40, 5w40?
I'm going to be changing my oil soon and would like some opinions on oil weights. I know Ford calls for the 15W40, but can also use 10W30. I've heard a lot about people running 5W40 though. Opinions?

Todd
 
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  #2  
Old 06-05-2007, 11:07 PM
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I run Rotella Synthetic which is 5w40. Makes for much easier starts in the winter. I do run it year round and my truck likes it.
 
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Old 06-06-2007, 09:05 AM
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I also run Rotella Syn 5W-40. Good stuff...
 
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Old 06-06-2007, 09:21 AM
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I run Schaeffers 5w40 synthetic. Great Stuff. I go 10,000 miles between oil changes.
 
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Old 06-06-2007, 01:52 PM
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My vote is for Shell snythetic 5w40.. no romp, romp after cold start..Get it at Walmart..
 
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Old 06-06-2007, 03:19 PM
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i have never seen a diesel rated motor oil that is anything but 15-40 or 5-40. i too run 5-40 syn (mobil 1 delvac) all year
 
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Old 06-06-2007, 03:22 PM
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Rotella makes an SAE30, and there are definitely others, but by far the most popular are the two you mentioned...
 
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Old 06-06-2007, 06:42 PM
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i use shell rotella T 15W40 non syn and change it every 5000 the company i wotk for uses some mobil syn i don't remeber what weight it is but it doesn't get very thick until about -10
 
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