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#4288904 - 12/30/16 01:29 PM Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles
k1rod Offline


Registered: 12/17/06
Posts: 289
Loc: Arizona
Oil not changed. I think I am going to try for another 10K miles. Oil filter is a Royal Purple Synthetic media filter.




Edited by k1rod (12/30/16 01:37 PM)

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#4288919 - 12/30/16 01:49 PM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: k1rod]
FlyNavyP3 Online   content


Registered: 07/04/16
Posts: 1238
Loc: Jacksonville, FL
Good looking report for your Duramax. How long has the oil been in service time wise? How is the truck used? You're no where near the lube condemnation limit for iron and the TBN is still pretty darn strong. I'd estimate without knowing more about the application that an additional 7,500 miles should be safe and likely if the truck is used for the next 10,000 miles like it was for this 10k then you'll probably be alright with another 10k.

Any makeup oil added?
_________________________
Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

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#4288956 - 12/30/16 02:25 PM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: FlyNavyP3]
k1rod Offline


Registered: 12/17/06
Posts: 289
Loc: Arizona
Hi Luke, The oil has been in service for one year and two months. During that time I added 1/2 of a quart of makeup oil. The truck is used in mixed service from being pressed into service as a commuter vehicle (both around town and highway) when my regular daily driver is in the shop, to hauling heavy loads of concrete roofing tile or whatever else I need to haul in it. I used to tow a 6000lb travel trailer around the country but haven't done that since this oil was installed. Actually I don't think I've done any towing on this oil. -Rod


Edited by k1rod (12/30/16 02:25 PM)

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#4289127 - 12/30/16 05:16 PM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: k1rod]
roadrunner1 Offline


Registered: 04/08/09
Posts: 1275
Loc: oh
The Duramax is known for shedding CU, its thought to be from the oil cooler and doesn't hurt a thing. Sample looks great, keep on trucking.
_________________________
'15 F350 6.7

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#4289301 - 12/30/16 08:52 PM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: roadrunner1]
k1rod Offline


Registered: 12/17/06
Posts: 289
Loc: Arizona
Originally Posted By: roadrunner1
The Duramax is known for shedding CU, its thought to be from the oil cooler and doesn't hurt a thing. Sample looks great, keep on trucking.


Thanks! Some of them do and some of them don't. I was wondering if the ones that do shed Cu are the ones that have the tow package option. I think the tow package option is what gives you that Copper oil cooler.

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#4300878 - 01/12/17 08:48 PM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: k1rod]
dnewton3 Offline



Registered: 05/14/07
Posts: 7113
Loc: Indianapolis, IN
There is no "tow package" with a Dmax truck, in terms of the engine and it's supporting equipment. You don't get a different oil cooler, etc. They are set up to tow from the factory.

The oil cooler is in the block right behind the oil filter mount. They use Cu in the construction. It's not uncommon to see Cu elevated when changing brands of oils, especially some brands of syns (I cannot explain the chemistry as to why it happens, but I accept that it does). As i understand it, the Cu will essentially oxidize (normalize) after a brand chemistry is established. Changing to another brand may or may not cause a reaction as it "normalizes" to the next chemistry package. This has been a noted phenomenon ever since the first LB7 Dmax came out.

Some of these images appear to show a sandwich plate design, and certainly appears to be Cu plated. However others look like aluminum. (ignore the obvious aftermarket type images).
see this:
http://www.bing.com/images/search?q=dura...&ajaxhist=0



You're UOA is fine. Leave the oil in there.


Edited by dnewton3 (01/12/17 08:49 PM)
_________________________
Conventionals vs. Synthetics isn't about which is "better"; it's about which lasts longer, while assuring safe operation, in relation to cost. Any product can be over or under utilized. The same applies to filters.
Make an informed decision; first consider your operating conditions, next determine your maintenance plan, and then pick your lube and filter. Don't do it the other way around ...

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#4300889 - 01/12/17 09:03 PM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: k1rod]
spasm3 Offline


Registered: 05/30/10
Posts: 8016
Loc: North Carolina
Plenty to TBN left, not a lot of silicon or soot.

P.S. Welcome back dnewton3 !


Edited by spasm3 (01/12/17 09:04 PM)
_________________________
13 elantra 65k 5w30 QSUD
03 chevy avalanche75k synpwr 5w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 500 miles mazda moly 0w20

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#4301186 - 01/13/17 08:47 AM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: dnewton3]
Garak Offline


Registered: 12/05/09
Posts: 23331
Loc: Regina, Saskatchewan, Canada
Welcome back, Dave! There are two threads of interest to you here and here.
_________________________
Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Wix 57356
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#4303944 - 01/16/17 08:56 AM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: k1rod]
beanoil Offline


Registered: 10/17/04
Posts: 2804
Loc: Midwest, Illinois
Off topic...
Good to see dnewton back after a 9 month absence. Stuck on a carnival ride? Pregnant?
_________________________
beanoil: Tough under heat, real dirty afterwards.

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#4305903 - 01/18/17 09:32 AM Re: Mobil Delvac 1 5W40 - LLY Duramax - 9750 Miles [Re: k1rod]
daman Offline


Registered: 09/23/06
Posts: 11114
Loc: Bad Axe, MI
We do 20,000 on our farm Dmax's, there easy on oil.
_________________________
"Always"....Mobil 1

Current fill: AFE 0w30

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