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L5P Duramax UOA #3 #5190991 08/19/19 06:42 AM
Joined: Aug 2018
Posts: 35
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oakaro68 Offline OP
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Hey everyone,

This is my 3rd sample for this truck from Blackstone labs. 39,451mi on truck and 5,275mi on Shell Rotella T4 15w40. UOA came back really nice, although my Regen cycles increased in frequency using this particular oil. That I did not care for. I switched to T6 5w40 and have already noticed more distance between Regens along with a more stable/consistent/predictable soot reading when all things stayed pretty consistent (fuel refill station, driving habits, temperature, etc).

Last edited by M56959; 08/20/19 07:54 AM.
Re: L5P Duramax UOA #3 [Re: oakaro68] #5191726 08/19/19 11:33 PM
Joined: Sep 2017
Posts: 272
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BlakeB Offline
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You might want to edit your personal info out of the report.

Re: L5P Duramax UOA #3 [Re: oakaro68] #5192632 08/21/19 05:35 AM
Joined: Aug 2018
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oakaro68 Offline OP
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Having a hard time editing this post. Here's the sample

Screenshot_20190821-052641.png
Re: L5P Duramax UOA #3 [Re: BlakeB] #5192633 08/21/19 05:36 AM
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oakaro68 Offline OP
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Originally Posted by BlakeB
You might want to edit your personal info out of the report.

Thanks BlakeB, totally spaced on that one. Good catch.

Re: L5P Duramax UOA #3 [Re: oakaro68] #5192859 08/21/19 11:27 AM
Joined: May 2007
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dnewton3 Offline
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Looks perfectly fine; as do just about all Dmax UOAs.
Stretch out the OCI and get some value from that oil.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: L5P Duramax UOA #3 [Re: oakaro68] #5193454 08/21/19 11:41 PM
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BlakeB Offline
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GM put out a bulletin for the 2019 L5P recommending a 7,500 mile, 300 hours or once per year oil change after some people were reporting that their OLM was counting down too quickly. My 2017 is well over 300 hours and still shows 28% on the OLM. My dad’s LML routinely goes ~500 hours between oil changes following the OLM.
We both make daily short trips of less than a mile where the engine doesn’t get up to operating temperature, but the OLM doesn’t seem to care.

Re: L5P Duramax UOA #3 [Re: oakaro68] #5193540 08/22/19 04:51 AM
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Posts: 8,148
dnewton3 Offline
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Well it's under warranty, so I get the concern ...
But the data is telling you that the wear rates are really low for all metals; that's typical of a Dmax.
There's no contamination to speak of.
Longer OCIs are certainly a doable thing. After all, you're paying for the data. Don't ignore it.
If you choose not to alter your OFCI plan (extending out), then I'd recommend you quit doing the UOAs. No sense spending money on data you're not going to use.
After all, it's not like Dmax engines are known to grenade from normal use.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
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