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paccar or cummings

clintm

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looking at new dump truck :Banghead:confused: will be an allison trans what the opinion on new engines MX13 or ISX12 the cummings looks simpler and easier to work on but there is a lot more paccars in stock pete and kw's.
 

Shimmy1

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More Paccars because they own Kenworth, and right now are one of only 2 options for engines in new Kenworth or Peterbilt trucks. Law of averages says they will be more prevalent. Myself, would not own a Paccar. Have heard way more trouble stories than Cummins. Anymore, I would never own a new truck.
 

clintm

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I don't like the new stuff ether got plenty of tractors setting around just nothing to make a quad axle dump out of. been looking all year nothing in the used market thats any better than the one I already running and mine needs to be gone through (painted ,new bed ,typical 500,mile refurb)can't down it that long.
 

Ruger_556

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Having been a Kenworth tech, get the Cummins. Paccar doesn't have their issues worked out yet and even their engineers don't know what do when they don't work.
 

clintm

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Thats kinda the jest I get from the shop guys that seem to be honest with me and not the salesman.
 

Truck Shop

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Only $850.00 for one oil change not including the filter for the wonder oil Cummins is using to stop oil consumption in ISX.

Truck Shop
 

Truck Shop

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Some Cummins ISX have had an issue of using more oil than normal. I believe It's Valvoline that makes the special oil that Cummins uses to stop the
high oil consumption in some their ISX engines. We have an outside customer that has 9 550 to 600 hp units and one that is 370 I believe, ranging in
years from 013 to 016. Three have had the wonder oil cure by Cummins. Run it for 15,000 miles dump it and go back to your regular oil.

Truck Shop
 

old-iron-habit

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Sounds like the stuff they added to the oil in Caterpillar dozers 60 to 90 years ago to seat the rings when all else failed. Run an abrasive oil thru it for awhile. Probably don't want it in there for any longer than they say.
 

clintm

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I test drove mx13 455 with allison and a ISX 12 450 8LL. The paccar did not impress me any there wasn't good throttle response and it shifted at 1700 (I already have to allison's in mack/volvo's)I think it was in the programming good jake brake though. the ISX felt more like the older engines and seemed to pull better.
 

LanmarFM

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Our company owns 3 trucks. 2 roll off trucks, 1 is a MX13 and the other ISX15. We also run a tri axle dump truck with a ISX15. The Cummins motors have a little over 140,000 miles on the and the Paccar just has 80,000 on it. All 3 are 18 speed eaton fuller transmissions.
I would not buy a Paccar. Ours consistently has small electrical issues with it. It usually is in the shop every couple of months for an engine light for something. The Paccar definitely doesn't have the history behind it like the Cummins. Also it is a few hundred more on service the Paccar compared to our Cummins.
The Cummins to me seems to be the better choice. Although one of ours burns oil and the other just went through an egr cooler and a rebuild of the whole after treatment system.
I would still be looking at a Cummins as a new purchase. They run good and the do a little better on fuel economy compared to the Paccar.
 

clintm

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the first impression when I opened the hood's. There is a lot of stuff to go wrong on the paccar and the more you got the more you got to work on:eek:
 

RZucker

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Yes and no. The PX motors are a Cummins rebadge, the MX engines are not even remotely similar to a Cummins and not affiliated at all.

IIRC, the MX engine is a worked over DAF engine from Europe. I got to see one of the prototype/test engines in a Peterbilt in '08... on the side of I-90 with a rod sticking out the side of the block. High pressure turbo went bad and she ran away.
 

Birken Vogt

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Yes the PX used to be 5.9 and 8.3 Cummins or whatever the displacement has changed to now. Those engines were fine for the most part although did have teething problems with DPF.

We took them to the Cummins shop for warranty work. The knew what they were doing and could deal with mother Cummins better than the KW or Pete shop who just threw on a bandaid and said it was fixed.

But this question is about the larger engines which are European in origin and everybody knows that is trouble.

As for the Allison shifting at 1700 or whatever, they put some pretty sluggish programs in them from the factory. Ours always needed to be gone over with a fine tooth comb from the engineering guy with a laptop in the passenger seat. But once that was done they shifted really great.
 

Scrub Puller

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Yair . . . .

Sounds like the stuff they added to the oil in Caterpillar dozers 60 to 90 years ago

I hadn't heard of that one old-iron-habit. It was pretty common to run a couple of teaspoons of Bon Ami into the intake of various engines back in the day not just Cat.

Cheers
 

old-iron-habit

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Yair . . . .



I hadn't heard of that one old-iron-habit. It was pretty common to run a couple of teaspoons of Bon Ami into the intake of various engines back in the day not just Cat.

Cheers

Thats the stuff. I did not know it was used in other engines as well. Makes sense it would have been though. This oil has to be doing the same thing, introducing an abrasive to wear parts in.
 

Birken Vogt

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Thats the stuff. I did not know it was used in other engines as well. Makes sense it would have been though. This oil has to be doing the same thing, introducing an abrasive to wear parts in.

I don't see how that is possible given the state of oil filters these days. One would think it would all end up in the filter immediately.
 

old-iron-habit

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I don't see how that is possible given the state of oil filters these days. One would think it would all end up in the filter immediately.

What you say makes sense. Any idea on what is in this "miracle" oil to make it work. I can see only two possibles, a abrasive to seat the rings, or a overhall in a can to fill in the worn spots. I wonder if they use a standard filter or something different one with this special oil. I am certainly curious now. Hopefully someone can give us more info on what it is and does.
 
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