Valvoline 15w40 or 5w40 - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7 Liter General Discussion General Chit Chat About the 6.7L 3rd generation Cummins - NO ADVERTISING

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post #1 of 42 (permalink) Old 07-28-2012, 10:44 PM Thread Starter
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Valvoline 15w40 or 5w40

i am about due for my first oil change, and i will be using valvoline's premium blue oil. i chose this because my local "small town" napa carries it, and it seems to be a popular choice after researching the forum.

i went in and asked for the 15w40, and they said they suggested the 5w40 synthetic. so, i bought it. after i got home i did some more research and it seems that the 15w40 is more popular. any suggestions?


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post #2 of 42 (permalink) Old 07-28-2012, 10:58 PM
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I just did my first change yesterday. I found this post while researching oils. I ended up going with Delvac for $12/gal at Sams Club.

Delvac, Delo or Neither - Bob Is The Oil Guy

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post #3 of 42 (permalink) Old 07-28-2012, 11:05 PM
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You live in ND. Go with the 5w40.

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post #4 of 42 (permalink) Old 07-29-2012, 10:07 AM
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You live in ND.
15w-40 for the summer
5w-40 for the winter.
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post #5 of 42 (permalink) Old 07-29-2012, 11:22 AM
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Quote:
Originally Posted by Snofarmer View Post
You live in ND.
15w-40 for the summer
5w-40 for the winter.
There is no reason to run 15w40 in the summer. For that matter, other than cost, there is no reason NOT to run 5w40 no matter where you are or what season it is (except the arctic during winter, where even thinner oil may be needed).

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post #6 of 42 (permalink) Old 07-29-2012, 11:38 AM
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Just run the conventional 15w40 with the big on it and never look back...spend the extra money you saved on your fuel bill,lol

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post #7 of 42 (permalink) Old 07-29-2012, 12:09 PM
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Other than 15w-40 is what cummins recommends for the summer.
  • For most conditions use a high quality 15W-40 oil with a dual rating of CF4/SH (or better)(summer)
  • For continuous operation below 10 degrees F, use 10W-30 CF4/SG


Cummins Recommended SAE Oil Viscosity Grades
Cummins' primary recommendation is for the use of 15W-40 multigrade for normal operation at ambient temperatures above -15C [5F]. The use of multigrade oil reduces deposit formation, improves engine cranking in low temperature conditions and increases engine durability by maintaining lubrication during high temperature operating conditions. Since multigrade oils have been shown to provide approximately 30 percent lower oil consumption, compared with monograde oils, it's important to use multigrade oils to be certain your engine will meet applicable emissions requirements. While the preferred viscosity grade is 15W-40, lower viscosity multigrades can be used in colder climates. Refer to Figure 1: Recommended SAE Oil Viscosity Grades at Ambient Temperatures.

Cummins can neither approve nor disapprove any product not manufactured by Cummins Inc. These claims are between the customer and oil supplier. Obtain the oil supplier's commitment that the oil will give satisfactory performance in Cummins' engines or do not use the oil.
Cummins Engine Oil Recommendations

And 5w-40 in just fine in arctic conditions or the conditions he'll see in ND in the winter, but I'd use a 10w-40.

Quote:
Originally Posted by MaxPF View Post
There is no reason to run 15w40 in the summer. For that matter, other than cost, there is no reason NOT to run 5w40 no matter where you are or what season it is (except the arctic during winter, where even thinner oil may be needed).
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post #8 of 42 (permalink) Old 07-29-2012, 12:17 PM
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I have ran 5-40 in the 2000 for years. the reason was changing oil at 15-17500 miles with oil analysis occsionally. Now with the 08 and the oil monitor and fuel dilution. I got 8000 miles on oil change before "change Oil" light came on. So the long oil change intervals will not happen, I'll stick with quality dino 15-40 on this one. Well, maybe change mind if delete. Getting over 20 pulling light trailer so can't complain

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post #9 of 42 (permalink) Old 07-30-2012, 12:52 AM
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There is no downside to running 5w-40. It is not "thinner" oil. It is thinner at cold temps, but it's viscosity cold is still much higher than when hot. When hot, it has the same viscosity as 15w-40. So, the advantage is faster pumping when cold, with zero downside when hot. So, in fact, 5w-40 is overall better than running 15w-40. Only downside is cost.

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post #10 of 42 (permalink) Old 07-30-2012, 01:42 PM
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agree 5/40 all year round for me 40 weight oil is 40 weight oil when it at operating temp. first number is only cold viscosity.

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post #11 of 42 (permalink) Old 07-30-2012, 02:10 PM
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Ok, so Cummins/Dodge recommends 15w40 for most of us. So what does everyone prefer as far as brand? Or better yet, rather than start an oil debate, I'll just ask is there anything that I should avoid? I've ran Mobil 1 synthetic for years, but it was because of increased protection and extended oil change intervals.

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post #12 of 42 (permalink) Old 07-30-2012, 02:16 PM
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I'm running the Valvoline 15w40 with a Baldwin oil filter. same thing I ran on my '05

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