Mobile CI-4+ in Cummins 5.9L

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I run a 2006 RAM 3500 with the 5.9L Cummins, 6spd Manual. Years ago I bought a pallet of Delo CI-4+ 15-40 in 5 gallon pails. I did this when the industry first made the move to CJ oils, and all the concerns about the pre-2007 diesels at that time. So my truck has only run CI-4+ oil since it was manufactured. This was the recommended oil spec by Cummins at time of manufacture. I am down to my last pail of Delo CI-4+. In the last few years Chevron stopped making the CI-4+. I found that Mobile still makes a Delvac conventional oil in CI-4+. https://www.mobil.com/en/mobil-delvac/products/engine-oils/mobil-delvac/mobil-delvac-mx-f2 So I'm thinking of sticking with the CI-4+ and not having to switch to the the CK oils. Thoughts? MileHi
 
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If you can get the Delvac MX, run it. It's been on my list of oils to try, but I've been too lazy to go to a Mobil distributor to get it. I just run Rotella T6 that is easily available at Walmart, and it does fine.
 
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Originally Posted By: Invasivore
Just run UOA or 2 before running out. Then switch to CK-4 to see if there is a major difference. I doubt you will see any change.
X 1 That's what I would do as well. I bought seven cases of the Schaeffers 15w40 CI-4 about 10 years ago and down to my last case. If you can find the Mobil Delvac MX for a decent price then go for it but there are some really good oils to choose from at a fairly decent price.
 

MileHi

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I called AgCrazy. They have it at $57 for 5 gal pail, but charge a lot for shipping, so no real savings unless you could pick it up from them. The Lubricant Store offers free shipping on orders over $300, so at 5 5-gal pails they send it to you at no charge. $72 for 5 gals for the Delvac MX F2. I'll look at the Amsoil. Note: The oil that is CI-4+ is the Delvac MX F2. The MX without the F2 is a CI-4 which is not the same spec. Thanks for the great replys.
 

MileHi

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Thanks m37charlie for those tips. The TRC Prospec III looks very good from their info. Plus its a synthetic, while the Delvac MX F2 is conventional. They tout a TBN of 15, which is the highest I've seen. The Amsoil CI-4+ rates a TBN of 12. The Amsoil is $42 a gallon. Ouch. The Delvac MX F2 is $14.50/gal.from Lubricant Store. I will call Texas Refining on Monday to learn the price of the Prospec III. BTW, the Cen-Pe-Co S3 is a CI-4 spec, not CI-4+. From what I saw...
 

MileHi

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Just spoke to Texas Refining. Their Pro-Spec III CI-4+ synthetic blend is $133.65 for a 6(six) gal pail, if you spend over $375, making it $22.25 per gal. $148.50 is their retail for 6 gal pails. They also provide no-cost (shipping only) used oil analysis samples if you are running their products, through Wearcheck. They sell primarily to truckers, farmers, construction, excavation, light truck owners etc., - the folks running pre-2007 diesels. I'm going to go with them and try for extended drain intervals using their oil sampling service. Want to stick with the CI-4+. https://www.texasrefinery.com/products/engine-oils/pro-spec-iii-synthetic-blend/
 
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Seeing as these isn't much info on this oil, i got some from a kinda local place to me it's 60.13 for case of 4 gallon jugs. they offer free delivery on Tuesdays. so next time I'll save the drive to go get it. anyhow i picked up a few cases and will get a VOA done asap. and try and post results here. then sometime this weekend it's going into my 08 deleted cummins with a Donaldson filter. at that price point, it's hard not to go with it. as the Valvoline i usually run is 14.95 gallon... so why not ge the older good stuff.. will see how my UOA look after a few changes tot eh new stuff.
 
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I don't know if it's still the case but Napa All Fleet 15w40 that I purchased about 2 years ago on a killer sale at Napa for $7.99/gal is rated CI-4+.
 
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