New Cummins oil change question

[Dvan]

Just bought a 2024 2500 with the 6.7l Cummins. It’s my first diesel.
It has 4000 miles on it, question is what are your thoughts on what oil to use,
Manual says 10w-30 rotella above 0* ambient temp. ( No mention of synthetic blend or full synthetic)
And 5w-40 rotella full synthetic for below 0* ambient temp.
I’m in upstate New York, generally stays above zero in the winter but usually get a few days maybe a week around zero.
My friend who’s a diesel fanatic, actually convinced my to go diesel said use 15w-40 rotellaT4 synthetic blend all the time, that’s what everyone uses around here.
I was going to use 10w-30 RotellaT6 full synthetic but now I’m not sure.
Thoughts??

 

[kirk35]

Don't listen to your friend the new diesels don't use 15w-40, Cummins went to hydraulic lifters and changed the oil requirements. Most folks seem to like the 5w-40 as it can be run year-round. I personally run Valvoline Premium Blue 5w-40 year-round here in South Mississippi.

 

[oledirteh]

I run full syn Amsoil 10-30 max life with mopar filter. i run amsoil in everything i own.

 

[tjfdesmo]

5W40 year-round. Delvac, Delo, Premium Blue, Rotella, or your brand of choice. LF16035 or DBL7349 filter. Good to go.

 

[mtnrider]

Follow your manual!!!! Listening to people that think they know better will leave you with a hefty engine repair bill. Using 15W-40 in your (19+) truck is a BAD idea. It has been proven to cause lifter failure.


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[tjfdesmo]

See page 2

 

[crazy jerry]

but his freind is a diesel fanatic. surely he would know whats what

 

[Ridgerunner665]

I'd use 5w-40 up there in NY...I used T6 10w-30 but I'm in TN.

Do not use 15w-40, no matter what anyone tells you.

 

[ricky_bobby]

5W-40 all year round Rotella T6 full synthetic

5W for the colder starts in winter, 40 for all around temperature use
When I lived more north its what I used on previous vehicles and what I use today in my Cummins and BMW here in central NC

 

[nlambert182]

I'm a long time diesel fanatic and I swear by 15W-40 Rotella T in the pre-2019 Cummins. Do not put it in the 19+ trucks. Run what the manual tells you (in NY I'd run 5W-40 year round), and stick with FleetGuard/Mopar filters. You'll be fine.

 

[Grams]

Look at the oil filler cap under your hood. It specifies the proper oil viscosity.

Use anything else and kiss your warranty good-bye. These new friends you’ve made here have saved your bacon. Be careful when you listen to anything else your other friend says.

 

[truck2569]

Just bought a 2024 2500 with the 6.7l Cummins. It’s my first diesel.
It has 4000 miles on it, question is what are your thoughts on what oil to use,
Manual says 10w-30 rotella above 0* ambient temp. ( No mention of synthetic blend or full synthetic)
And 5w-40 rotella full synthetic for below 0* ambient temp.
I’m in upstate New York, generally stays above zero in the winter but usually get a few days maybe a week around zero.
My friend who’s a diesel fanatic, actually convinced my to go diesel said use 15w-40 rotellaT4 synthetic blend all the time, that’s what everyone uses around here.
I was going to use 10w-30 RotellaT6 full synthetic but now I’m not sure.
Thoughts??

I have a 2013 ram 6.7 Cummins I use 5w40 in mine and have since new. And I have 600,000 miles on mine. I live in Kansas where the weather is always changing.

 

[06Sledhead]

5W40 year-round. Delvac, Delo, Premium Blue, Rotella, or your brand of choice. LF16035 or DBL7349 filter. Good to go.

Miron rating of these filters
Fleetguard LF16035 30 microns
Donaldson DBL7349 15
Baldwin BT7349 12

I use the Baldwin and Rotella T6 5w40 year round.

 

[06Sledhead]

Miron rating of these filters
Fleetguard LF16035 30 microns
Donaldson DBL7349 15
Baldwin BT7349 12

I use the Baldwin and Rotella T6 5w40 year round.

I did some more checking and the Baldwin filters are only 50% eff. at 12 microns and 99% at 30 microns
The Donaldson is 99% eff at 15 microns.
Think I will be switching to Donaldson.

 

[Sandevino]

Retired diesel tech here…. 5W-40 is what I recommend for a year round oil. Good protection when cold and hot and easy to come by.

 

[Ritchie_Rich]

Follow your manual. Don’t listen to your “friend”.
Are you towing loads a lot? If he convinced you to go diesel as a grocery getter-DD, he didn’t do you any favors.

 

[Grams]

Miron rating of these filters
Fleetguard LF16035 30 microns
Donaldson DBL7349 15
Baldwin BT7349 12

I use the Baldwin and Rotella T6 5w40 year round.

The OEM Mopar MO285 is a 60-micron filter, so it seems that the Cummins recommended Fleetguards are just fine, IMO. (Micron ratings of oil filters can be misleading depending upon efficiency-ratings. Additionally, the particles which damage engines are far larger than 60 microns. Just sayin’)

 

[06 Dodge]

The OEM Mopar MO285 is a 60-micron filter, so it seems that the Cummins recommended Fleetguards are just fine, IMO. (Micron ratings of oil filters can be misleading depending upon efficiency-ratings. Additionally, the particles which damage engines are far larger than 60 microns. Just sayin’)

If what you say is true then why does Cummins recommend using oil filters of 30 micron and not 60 micron if only things bigger than 60 micron will hurt the engine?

 

[Grams]

If what you say is true then why does Cummins recommend using oil filters of 30 micron and not 60 micron if only things bigger than 60 micron will hurt the engine?

It’s double-speak due to the inconsistency of how filters are rated. If a filter is rated 95% at 30 microns… it may still pass 60 micron particles. The language used is misleading.
Baldwin BT7349 are “rated” at 12 microns….(and made/owned by one of the best and most reputable American mfr’s Parker-Hannfin) …. and they meet Cummins and Ram requirements of 60 micron at 95% efficiency. But that doesn’t mean it’s necessarily any better for your engine.

BTW, you might note that these filters Cummins and Ram approve have NO anti-drainback valve and NO By-pass valve either. The vertical mounting explains the lack of need for anti-drain-back valve… but it’s puzzling no bypass is required.
I “assume” it’s because the media isn’t really all that restrictive.

PS: It also probably means that the filtration requirements of this engine is so simple that cheap Fram PH3976A from WalMart priced at less then $5 is just fine.

For more info on micron ratings of filters, see: https://ecogard.com/resources/artic...-duty,for the application under consideration.

 

[06 Dodge]

It’s double-speak due to the inconsistency of how filters are rated. If a filter is rated 95% at 30 microns… it may still pass 60 micron particles. The language used is misleading.
Baldwin BT7349 are “rated” at 12 microns….(and made/owned by one of the best and most reputable American mfr’s Parker-Hannfin) …. and they meet Cummins and Ram requirements of 60 micron at 95% efficiency. But that doesn’t mean it’s necessarily any better for your engine.

BTW, you might note that these filters Cummins and Ram approve have NO anti-drainback valve and NO By-pass valve either. The vertical mounting explains the lack of need for anti-drain-back valve… but it’s puzzling no bypass is required.
I “assume” it’s because the media isn’t really all that restrictive.

PS: It also probably means that the filtration requirements of this engine is so simple that cheap Fram PH3976A from WalMart priced at less then $5 is just fine.

For more info on micron ratings of filters, see: https://ecogard.com/resources/articles/truth-about-oil-filter-micron-ratings/#:~:text=Passenger car and light-duty,for the application under consideration.

My self I use the 20 micron Donaldson DBL7349, as for Baldwin its 12 micron nominal rating an not absolute like Fleetguard Strapore** as for the Mopar filter not sure who makes it any more (but before 2009 it was Fleetguard,) but then I have put a Mopar oil filter on my 5.9l or 6.7l Cummins engines, as for Fram at one time they were a very good gas engine oil filter but I would not install one on my Cummins, I will never forget the bulletin Dodge put out about Fram oil filters fu-baring a few 5.9l Cummins engines an to this day I still do not trust them...

**Fleetguard Strapore LF 16035, 24.60 micron (c) @ 100%: https://www.fleetguard.com/s/productDetails?propertyVal=LF16035&propertyField=home&language=en_US