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Paccar mx 13 #5043781
03/15/19 12:26 PM
03/15/19 12:26 PM
Joined: Mar 2019
Posts: 4
Canada
Tyry15 Offline OP
Tyry15  Offline OP

Joined: Mar 2019
Posts: 4
Canada
I am new to this whole oil analysis stuff so i was hoping i could get some opinions on my report. Also i was wondering if i could lengthen my oil change interval? I appreciate the help

Attached PDF document
Oil sample.pdf (37 downloads)
Re: Paccar mx 13 [Re: Tyry15] #5043797
03/15/19 12:42 PM
03/15/19 12:42 PM
Joined: Dec 2017
Posts: 1,737
US
JLTD Offline
JLTD  Offline

Joined: Dec 2017
Posts: 1,737
US
Tell me if I'm reading this right - 40846km (~25000 miles) on the OCI? Looks like pretty low wear numbers. Jury's out on extending until some analysis experts come along.


I use the overseas owner's manual to choose my oil.

Using AMSOIL

Hers: 2008 Jeep Liberty 143k, SS 5w30/Amsoil

His: 2015 4Runner 51k, OE 5w30/Wix

Re: Paccar mx 13 [Re: Tyry15] #5043814
03/15/19 01:02 PM
03/15/19 01:02 PM
Joined: Mar 2004
Posts: 21,834
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,834
Upstate NY
Something is not right. If there are really 25,000 miles on the oil, then the FE wear numbers are not right. To low.

I would not go above 10,000 to 12,000 mile OCI without getting a TBN. TBN is critical to extending an oil change interval..


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Paccar mx 13 [Re: Tyry15] #5043852
03/15/19 01:35 PM
03/15/19 01:35 PM
Joined: Aug 2017
Posts: 493
WY
sloinker Offline
sloinker  Offline

Joined: Aug 2017
Posts: 493
WY
OTR truck with a huge sump and running multiple filters may well have a 25,000 OCI.

Re: Paccar mx 13 [Re: Tyry15] #5043894
03/15/19 02:21 PM
03/15/19 02:21 PM
Joined: Mar 2019
Posts: 4
Canada
Tyry15 Offline OP
Tyry15  Offline OP

Joined: Mar 2019
Posts: 4
Canada
Yes it has 25000 mi on oil change

Re: Paccar mx 13 [Re: Tyry15] #5043972
03/15/19 03:21 PM
03/15/19 03:21 PM
Joined: May 2013
Posts: 1,144
upstate NY
dustyroads Offline
dustyroads  Offline

Joined: May 2013
Posts: 1,144
upstate NY
Show off!!! thumbsup

With regard to oil analyses, the Paccar MX13 is the lowest wearing heavy duty engine I've ever seen. I've seen several UOAs for that engine and this report is pretty typical. Extraordinarily low wear metals is nice, but the silicon is very good and there's no signs of antifreeze intrusion, either. Soot says 0, my reports run less than 1%, too, but I guess yours is most impressive. I'm not sure what your engine has for filtration, but those are great results.

I don't know what oil you're running and it doesn't matter. I no longer give much of a hoot about TBN and TAN, so I'm not concerned about the lack of it here on this report. All I can say is, feel free to add some miles (KMs in your case) and check again. It depends on your comfort level. Keep track of the oil on the dipstick, watch the coolant level closely, keep track of the air intake plumbing and barring any problems, you could most likely double the interval with ease. That's all up to you and how far you want to take it.

If you're not using CK-4 oil, I would encourage you to do so. It'll help you out with extended OCIs. It's amazing how well it prevents thickening of the oil in long runs, regardless of how much you work it.

Edit: if you don't have a vacuum pump for pulling a sample out of the sump via the dipstick tube, Toromont Cat could sell you one. That way you can pull samples during an OCI to keep close watch of the oil as you extend. No need to drain just to get a sample.

Last edited by dustyroads; 03/15/19 03:43 PM.

2013 F150 XLT 5.0 4X4 104k miles
Edge 5W-30 / Fram 10575
Re: Paccar mx 13 [Re: dustyroads] #5044026
03/15/19 04:01 PM
03/15/19 04:01 PM
Joined: Mar 2019
Posts: 4
Canada
Tyry15 Offline OP
Tyry15  Offline OP

Joined: Mar 2019
Posts: 4
Canada
Awesome thanks so much. Just wondering which numbers should i pay the most attention to for extending OCI and what would those values be?

Re: Paccar mx 13 [Re: Tyry15] #5044308
03/15/19 07:05 PM
03/15/19 07:05 PM
Joined: May 2013
Posts: 1,144
upstate NY
dustyroads Offline
dustyroads  Offline

Joined: May 2013
Posts: 1,144
upstate NY
First look for any indication of a problem; checking the soot, silicon, fuel, and oxidation (oil thickening). Excessive amounts of any of those can relay a problem. Your engine has something like 750k miles and while it could easily go twice that before needing an overhaul, it's enough miles that things could start to fail, or at least lose efficiency.

Right now, it appears that your engine is as healthy and efficient as my 400k mile Detroit. As long as it remains that healthy, you can safely add many miles/KMs to your intervals. Did you have to add any oil? How much? If you're pouring in gallons of oil for top-off, then that would skew things a bit. I overlooked "Shell" earlier, so I would guess that it's good ol' T4.

If the oil thickens much out of grade (over 16.3 for a 15W-40 I believe) then it may be time to change, or at least getting close. Just my opinion, but maybe not scientifically accurate. Caterpillar labs measure oxidation. If you were to get a sample of fresh oil tested and then test the subsequent used oil samples, I don't know what the condemning number would be for oxidation.

Excessive soot that overwhelms the oil's ability to disperse it will cause extra wear. If you have a bad injector (or two, three, etc), maybe a problem with EGR or the turbo, you could develop high soot and eventually high wear. Just something to keep in mind as your engine piles on the miles. Keep track of how the engine behaves, the fuel efficiency and the visuals to help keep yourself ahead of any problems before they get out of hand. Oil analysis is an excellent tool for finding problems early on.

Once you push the oil too far, it's going to show up in increased wear metals. One thing that many people go by is the TBN/TAN relationship. The theory is that once the acid number (TAN) exceeds the remaining base number (TBN), the oil is done. I'm in no position to say that's wrong, but I've never seen proof of it in my own results. It's certainly not something I can make a blanket statement about in either way, but I don't worry about TBN/TAN too much anymore. If I pay extra for those, it's mostly just for fun or pure curiosity.

Edit: to be more direct in answering your question about what values to look for; the closest I can get to that is the viscosity increase I mentioned above. And that's only my opinion. There are most likely condemnation points for the different wear metals (each engine model a little different), but I don't know what they are for the MX13. I highly doubt you'll ever reach any condemning numbers unless something goes wrong. There's probably a condemning soot number as well, just don't know what it might be. The oil is capable of handling quite a bit but I'm at a loss and couldn't say just how much at the moment. I'm way past my bedtime and need some sleep. blush

Last edited by dustyroads; 03/15/19 07:18 PM.

2013 F150 XLT 5.0 4X4 104k miles
Edge 5W-30 / Fram 10575
Re: Paccar mx 13 [Re: dustyroads] #5044374
03/15/19 08:01 PM
03/15/19 08:01 PM
Joined: Mar 2019
Posts: 4
Canada
Tyry15 Offline OP
Tyry15  Offline OP

Joined: Mar 2019
Posts: 4
Canada
Hey no problem i really appreciate your help. I have not had to add any oil between changes. And yes it is the t4 oil.

Re: Paccar mx 13 [Re: Tyry15] #5045699
03/17/19 10:21 AM
03/17/19 10:21 AM
Joined: May 2013
Posts: 1,144
upstate NY
dustyroads Offline
dustyroads  Offline

Joined: May 2013
Posts: 1,144
upstate NY
If you do extend the intervals, you could try adding 10k-15k Km to the 40k km OCI you have posted here, and continue to extend based on the results. There's an increased cost for learning what interval the oil is capable of in your engine, but it'll pay big dividends once you've got it figured out. The cost of pulling a couple (or a few) samples throughout the next interval is nothing compared to the cost of short OCIs.

dnewton3 is our resident expert analyst with lots of data and the ability to understand it. If you can follow up with future reports, there's help available here to help advise you on when to call it good.

I'm still fairly new to longer intervals, but it's going quite well and see no reason why you couldn't match (or go beyond) what I've been doing. I know there's a comfort factor to consider, too. It took me a few long intervals with good results to get used to it. smile


2013 F150 XLT 5.0 4X4 104k miles
Edge 5W-30 / Fram 10575
Re: Paccar mx 13 [Re: Tyry15] #5049178
03/20/19 05:00 PM
03/20/19 05:00 PM
Joined: Feb 2015
Posts: 905
Sask, Canada
BrianF Offline
BrianF  Offline

Joined: Feb 2015
Posts: 905
Sask, Canada
Email Paccar and see what their condemnation limits actually are. That will give you some reference points to look for. Cummins was super quick to get back to me with data for my ISB6.7 in my 3500.


2006 Trailblazer LT. QSUD with Fram Ultra.
2017 Ram 3500 SLT Megacab. Duron SHP 10w30 with Hastings LF608.
1993 GMC 1500. QSAD with Fram PH5
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