Oil: 5w40 vs 15w40? - Ford Powerstroke Diesel Forum

View Poll Results: Oil? 5w40 vs 15w40
5w40 19 65.52%
15w40 10 34.48%
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post #1 of 9 Old 08-07-2008, 06:44 AM Thread Starter
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Oil: 5w40 vs 15w40?

Right now I have Rotella T synthetic 5w40 and I just saw that advance has Valvoline Premium Blue syntheic 15w40 on sale for $8.88 per gallon, so I was considering using that for my oil change coming up.

What are everyone's thoughts on viscosity? I'm in western ny, where the winters can get cold.




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post #2 of 9 Old 08-07-2008, 07:08 AM
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You will be fine either way with a synthetic. The cold flow properties are excellent.

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post #3 of 9 Old 08-07-2008, 07:37 AM
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I don't think the $8/gal premium blue is synthetic, is it? That would be a heck of a deal...

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post #4 of 9 Old 08-07-2008, 05:25 PM Thread Starter
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yeah i'm pretty sure its the full synthetic... i'll double check. That's a lot cheaper than $18 for the rotella t full syn




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post #5 of 9 Old 08-07-2008, 05:26 PM
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The $8 stuff is a synthetic blend IIRC

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post #6 of 9 Old 08-07-2008, 07:38 PM Thread Starter
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hmm... Well either way I need to do an oil change haha since my fumoto valve just came in

seems like 5w40 is winning the vote




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post #7 of 9 Old 08-07-2008, 07:57 PM
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Quote:
Originally Posted by technoticmedia View Post
hmm... Well either way I need to do an oil change haha since my fumoto valve just came in

seems like 5w40 is winning the vote

+1 FUMOTO VALVES ARE DA BOMB!!!! Dont flow as fast as pulling the plug, but its a nice straight stream, bet you can fill a jug straight out of valve and not even have to dirty a pan!!! Makes oil change somewhat enjoyable now.



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post #8 of 9 Old 08-08-2008, 05:14 AM Thread Starter
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rock on! glad to hear




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post #9 of 9 Old 08-08-2008, 10:01 PM
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premium blue vs. premium blue extreme

Premium Blue 15w40 is dino and Premium Blue Extreme 5w40 is synthetic.

Engine Oil

Extreme Engine Oil

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