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Well I'm going to be doing my yearly overhead adjustment in December. I will post pics. And the cams on these engines are indeed an issue.
Cummins ISX 622.6k mi; Delo 22.6k miles; unconventional lube additives
- Thread starter ProstarMex
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Your “mechanic” is off his rocker. Gear oil has no business in any internal combustion engine. It’s embarrassing to us fellow technicians that pride themselves in their work to hear that a “master” Cummins mechanic made these recommendations. Either he is poorly trained, an idiot, or trying to cover up some major flaw, or all of the above by pushing that manure on to customers.
FWIW we have many X12s, an X15, and a couple older 12L ISX powered fire apparatus in our fleet and they see nothing but safety Kleen 15w40 syn blend. No issues and they last a LONG time with abusive service and long drain intervals
FWIW we have many X12s, an X15, and a couple older 12L ISX powered fire apparatus in our fleet and they see nothing but safety Kleen 15w40 syn blend. No issues and they last a LONG time with abusive service and long drain intervals
And no oil nor any additive will ever correct a material or design defect, assuming one exists in the first place.
If this truck has a DPF, and it should for that year, you are killing it with your mixture.
An ISX with good filters and proper spec oil will easily reach 800k to a million miles.
Your 'master tech' is an idiot if he thinks this is good for your engine.
An ISX with good filters and proper spec oil will easily reach 800k to a million miles.
Your 'master tech' is an idiot if he thinks this is good for your engine.
It's a roller cam. The roller bearings are the problem. No additives will fix a defective part
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Would it be ok to run delo 15 w40 plus 1 gal of this oil in crankcase?
Generally speaking, it’s not a good idea to mix oils of different brands and formulations as they may not be compatible.
There a quite a few synthetic 5w40 and 15w40 HD diesel oils available that have 1200-1400 ppm of Zinc. Why do you feel that’s not sufficient?
If you really want to mix something my recommendation would be 10 gallons of Schaeffer 15w40 and 1 gallon of their 132 oil treatment. That is the only way I would mix anything and it is totally unnecessary in your isx. As @Chris142 said, no amount of additive will fix the roller and bearing problems they had. Plus, I believe that problem has been corrected now anyway. Correct me if I’m wrong.
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That's right where I'd like to be 1200 - 1400 I don't want to use synthetic as that's not goof for an OTR semi truck , plus I change my oil right at 12k and running 5w40 will just be to expensive.
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I'm doing it as a preventive measure along with other things. When I was running just Delo 15w40 UOA was showing low zinc no more than 1000 ppm.
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No I don't think so buddy. Very , very highly respected and knowledgeable people. There work speaks for itself.
You have no idea what you’re talking about.
That’s ironic, synthetic motor oil is not good but adding gear oil or experimenting with some hybrid mix of different brands is? I’d rethink to whole gear oil thing it really sounds like a bad idea and my have catastrophic effects.
https://www.walmart.com/ip/Mobil-De...etic-Diesel-Engine-Oil-15W-40-5-Gal/327035382
Who told you that synthetic is not good for an OTR truck? That might be the most ridiculous thing I've heard all day.
Diluting your additive package of a good engine oil with gear oil containing things that have no business being in an engine far outweighs any "preventative maintenance" that you might be doing.
4WD
$50 site donor 2025
Gear oil is not only N/A - but it and additive in bottles are expensive - instead- pay slightly more for a premium HDEO
https://bobistheoilguy.com/forums/threads/ford-6-0-245k-miles-delvac-extreme-15w-40.352360/
https://bobistheoilguy.com/forums/threads/ford-6-0-245k-miles-delvac-extreme-15w-40.352360/
Is that more sage advice from your master mechanic? You're either trolling or need to find a better shop.
I’m becoming convinced this is a joke. Too many goofy things all at once to be legitimate. Plus the OP is not responding to anything of substance in this thread, just adding more fuel to the fire with each post. He’s not listening or considering anything being said. When posters do that it means they are only trying to troll the board.
The ISX is a modern Diesel engine and therefore compatible with today’s formulated oils. In my opinion ZDDP is an old school thinking with modern oils. There are other additives that compensate for the reduced amount of zinc. There’s lots of ISX’s on the road with nothing but straight HDEO in them.
I also don’t understand why you spend extra money on gear oil and additives yet won’t spend the extra money for synthetic. Seems odd to me. Personally I use Mobil Delvac 1300 and I’m switching to Mystik JT8. Both are semi synthetic 15w40. You should do a run with straight HDEO and see what your UOA tells you then. With 11 gallons of oil I’d suggest a 12k oil change is wasting money. I go 10k on 3 gallons in my 6.7L.
All that said to each their own.
Just my $0.02
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