About to purchase a 2024 6.6 Duramax 3/4 ton. Been out of the diesel world about 11 years, no way my Tundra can yank a 18,000 toy hauler. In the past in my old Cummins, Ive always used Delvac or Delo......is Delvac still really good stuff? You guys still running 10k-15k miles between changes? My truck will be towing all highway, but pulling a 18k toy hauler......
2024 Duramax......24k Miles Delvac Still Good?
- Thread starter FranklinJL
- Start date
Delvac is good stuff. I wish i could find Delvac 1 in 5w40 here in Sweden for the winter use. Now i run Shell Rimula 15w40 in my Duramax LMM
4wd
$50 site donor 2026
have not seen an SDS since 2024 - but it was still 30-50% PAO
A very strong contender is Mobil 1 5W-40 Turbo Diesel Truck. It looks to have a slightly higher HTHS than Delvac 1 5W-40, 3.8 v 3.7, and there is slightly higher ZDDP from what I read. Note: Both oils are technically capped at 1200ppm ZDDP to meet CK-4 specs.
Mobil 1 Turbo Diesel Truck looks like it has a touch more calcium too. 1450ppm vs 1250ppm.
Identical Mg at 900ppm.
Pour points are identical at -54ºF. They are very similar oils.
Mobil 1 Turbo Diesel Truck looks like it has a touch more calcium too. 1450ppm vs 1250ppm.
Identical Mg at 900ppm.
Pour points are identical at -54ºF. They are very similar oils.
This is the link to the punchline:
If we assume that 2026 ESP 5w-40 is the same as 2015 edition ESP 1 0w-40, then yeah, it's great stuff.
Thanks to some sleuthing from a colleague, I was able to obtain some photos of the famous 26k hour QSK60 excavator teardown. This engine burned 1.6 million gallons of fuel in a brutal 90% duty cycle excavator application. It was a premium GTL fuel and the oil used was Delvac, but supposedly a 0w-40 grade? Everyone agrees it was Delvac though. Circa 2015.
Gear wear:
Geartrain thrust bearings:
Gear Bushing.
Bearings:
Crank Journals:
Note the immaculate camshaft in the...
Gear wear:
Geartrain thrust bearings:
Gear Bushing.
Bearings:
Crank Journals:
Note the immaculate camshaft in the...
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I tried checking the mobil site and Mobil Delvac 1 ESP 5w40 SDS wouldn’t load for me. Weird.
I found this SDS from 2024 and it’s what I remember. No PAO in Mobil Delvac 1 and not an HDEO with premium ingredients like it used to be.
https://evosupplygroupcatalog.sfo3.digitaloceanspaces.com/brands/files/Mobil/127863-SDS.pdf
Mobil 1 Turbo Diesel Truck did load for me and it doesn’t have PAO either.
Mobil Delvac 1 is probably still the best HDEO sold at Walmart, but Mobil changed the formula when they rolled out the CK-4 version. It’s not the legendary product you remember. Ironically this is also when it started being sold at Walmart.
If you want a 5w40 HDEO that has higher HTHS for maximum protection I’d recommend checking out P66 Guardol XT. It used to have some PAO but they probably took it out. It’s about $30 a gallon from a distributor.
AMSOIL Signature Series, HPL & Ravenol NDT are also options if you want to pay the premium price.
I found this SDS from 2024 and it’s what I remember. No PAO in Mobil Delvac 1 and not an HDEO with premium ingredients like it used to be.
https://evosupplygroupcatalog.sfo3.digitaloceanspaces.com/brands/files/Mobil/127863-SDS.pdf
Mobil 1 Turbo Diesel Truck did load for me and it doesn’t have PAO either.
Mobil Delvac 1 is probably still the best HDEO sold at Walmart, but Mobil changed the formula when they rolled out the CK-4 version. It’s not the legendary product you remember. Ironically this is also when it started being sold at Walmart.
If you want a 5w40 HDEO that has higher HTHS for maximum protection I’d recommend checking out P66 Guardol XT. It used to have some PAO but they probably took it out. It’s about $30 a gallon from a distributor.
AMSOIL Signature Series, HPL & Ravenol NDT are also options if you want to pay the premium price.
FWIW, my father purchased his 2022 Silverado L5p new and it's doing fine on 15w-40 Foamtella T6.
Interesting that the claim above is 'no PAO'. A -54ºF pour point and an HTHS would indicate PAO or esters.
It’s not a claim. The SDS I found online from 7/16/2024 doesn’t list PAO like the old CJ-4 version did.
It also says the PP is -35C.
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Delvac 1 ESP 5w40 CJ-4, 2015 version.
https://petroleumservicecompany.com...raVbn-QDH2PxYT2ToodWRCt0sRozNsqF2yx9P3ZihNZbS
( I have about 15 gallons left of this stuff I hoarded 10 years ago. Using it in my truck with RLI booster pak)
Delvac 1 ESP 5w40 CK-4 2024 version.
https://evosupplygroupcatalog.sfo3.digitaloceanspaces.com/brands/files/Mobil/127863-SDS.pdf
https://petroleumservicecompany.com...raVbn-QDH2PxYT2ToodWRCt0sRozNsqF2yx9P3ZihNZbS
( I have about 15 gallons left of this stuff I hoarded 10 years ago. Using it in my truck with RLI booster pak)
Delvac 1 ESP 5w40 CK-4 2024 version.
https://evosupplygroupcatalog.sfo3.digitaloceanspaces.com/brands/files/Mobil/127863-SDS.pdf
Here is one from 08/25 :
https://www.exxonmobil.com/download...t/Pdf/MsdsIAImages/ZpzHHOOnukyJjXvXUI0UCQ.PDF
≥25 - ≤50 CAS: 848301-69-9 , GTL
www.shell.com/content/dam/shell/assets/en/business-functions/chemical/documents/product-stewardship-lubes-gtl-base-oils.pdf
P.S. Pennzoil Platinum is -48C in the tds :
https://www.mobil.com/en/sap/our-products/products/mobil-delvac-1-esp-5w40
https://www.exxonmobil.com/download...t/Pdf/MsdsIAImages/ZpzHHOOnukyJjXvXUI0UCQ.PDF
≥25 - ≤50 CAS: 848301-69-9 , GTL
www.shell.com/content/dam/shell/assets/en/business-functions/chemical/documents/product-stewardship-lubes-gtl-base-oils.pdf
P.S. Pennzoil Platinum is -48C in the tds :
https://www.mobil.com/en/sap/our-products/products/mobil-delvac-1-esp-5w40
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OP - I'm not as familiar with new diesels and not sure what your use is, but I wouldn't push these OCI that long. The sweet spot for my PS diesel is 5,000 miles, but I frequently change based on calendar which can be 2-3k miles. I pull less weight but can be about 25k pounds total GCW. Pulling 18k pounds, even on highway use only, leads me to believe that this is severe service. Maybe the oil monitor compensates, but I wouldn't push it to far, even with a great oil.
That’s the same SDS I found. Revision/issue date 7/16/24.
RoSmella.What other names are there?
- Rotella
- Foamtella
- Brotella
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I have sorta fell in love with PETRO Canada
https://petrocanadalubricants.com/en-ca/brand/duron-uhp#d06a08bd-3123-496c-a434-d09ce623c488
I have sorta fell in love with PETRO Canada
https://petrocanadalubricants.com/en-ca/brand/duron-uhp#d06a08bd-3123-496c-a434-d09ce623c488
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