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Re: Oil Analysis Results for 2002 LB7 Duramax [Re: Bdsankey] #5197522 08/26/19 07:24 PM
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Originally Posted by Bdsankey
Originally Posted by oakaro68
Originally Posted by Bdsankey
Originally Posted by dnewton3
As for the wear; it's pretty normal. The Cu is common if you've recently switched to Amsoil; a reaction of chelation. The Pb is probably a spike that will subside; happened to mine once. There's no Pb associated with the cooler.

I presume you are only sampling and not OCI'ing? It's far too soon to be dumping lube.

I don't really understand why you're upgrading the oil cooler. Do you have the LB7 significantly "tuned up" to where it's producing a LOT more power (heat)? Do you track the oil temps; is there evidence they are too high?



I am just sampling, not dumping. The latest oil sample went out yesterday to OAI and should have results to post back on Friday or Monday. Yes I have recently switched. Previously the truck had Cenpeco S3 15W40 in it (Cenpeco S3 Data Sheet). The reason I switched was purely because Amsoil sponsored Diesel Power Challenge 2019 and provided me with 10gal free of any engine oil. I chose 15W40 Heavy Duty Diesel Marine since I've run it in the past as a child (all my dad used in his pickups/HD equipment) and the results were good. It also was all that was used in my 2005 duramax by the previous owner. At 342k when the motor was torn down (replaced due to bent connecting rod) all the bearings looked absolutely brand new and held clearance within manufacturer's spec for new. The engine in this 2002 is a little tired (some blow-by that I don't like, lower oil pressure than I'd like which is 20psi hot/40 psi cruising down the freeway hot and towing) but it hasn't shown me any signs it needs to be replaced yet. I am planning on running the remaining 7.5 gallons of Amsoil 15W40 HD Diesel Marine through this engine but will only change once this forum or the testing indicates a need.


Before this year I've always done 5k drain intervals on all my diesel pickups. Yes, I understand this was wasting money as the oil did not warrant a replacement but it was what I've done since I was a child and kept up with it regularly. My other truck gets an oil change every 8 sled hooks or 1000mi but it also makes 1300hp+ and money isn't an issue there. I eventually plan on going back to Cenpeco S3 oil once this stock of Amsoil is depleted. They were also gracious enough to provide me with 10gal of Torque Drive ATF (my favorite synthetic ATF for an Allison) that will be going in the transmission once it is built this winter.


The reason for upgrading the cooler is to manage oil temps while towing heavy. Duramax trucks are quite known to run hot oil temps when towing quite heavy (~15k+). The new 2020 oil cooler is a cheap investment as it is roughly $250 for all the required parts to install. I do have the truck tuned but only run on a 75hp tow tune. Coolant temps stay in check (under 200F) as well as trans temps (under 200F) when towing in 90F-95F ambient conditions grossing 24k lbs.


What was the bent rod from? what the truck tuned? That's pretty impressive about the bearings/clearances!



LB7/LLY duramax trucks (01-05) have very weak connecting rods from the factory. They tend to fail north of 650hp, especially on a drop-in upgraded turbo or compound turbos. I had an upgraded drop-in turbo with upgraded injectors and pump. The truck made ~700hp/1200tq.


Well (edit - mod) more than double stock power and bearing clearances were good as new after 342k miles. Seems like every day I have more respect for the Duramax

Last edited by dnewton3; 08/27/19 03:49 AM.
Re: Oil Analysis Results for 2002 LB7 Duramax [Re: Bdsankey] #5197737 08/27/19 06:39 AM
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Bdsankey Offline OP
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Originally Posted by oakaro68
Well (edit - mod) more than double stock power and bearing clearances were good as new after 342k miles. Seems like every day I have more respect for the Duramax



I don't know if the respect is due to the engine, 5k intervals its entire life until failure, or the lube quality. What I do know is the lube is holding up extremely well (as so it seems) at 7500mi. I am thinking my next sample will be at 15,000mi, is this too long to wait?

Last edited by Bdsankey; 08/27/19 06:39 AM.

Current Rides:
Toy: 2005 Chevrolet Silverado 2500HD, Duramax Diesel (LLY)
DD/Tow Rig: 2002 Chevrolet Silverado 2500HD, Duramax Diesel (LB7)
Re: Oil Analysis Results for 2002 LB7 Duramax [Re: Bdsankey] #5197852 08/27/19 09:29 AM
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Originally Posted by Bdsankey
Here is an updated report at 7510mi. When should I pull the next sample? 10k, 12.5k, or 15k? Same lube/filter.


My vote is 12 or 15K for next sample, and to keep using oil analyzers. Very good oil you have in her now.


2014 F250 6.7L PSD
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Re: Oil Analysis Results for 2002 LB7 Duramax [Re: claluja] #5197856 08/27/19 09:35 AM
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Originally Posted by claluja
Originally Posted by Bdsankey
Here is an updated report at 7510mi. When should I pull the next sample? 10k, 12.5k, or 15k? Same lube/filter.


My vote is 12 or 15K for next sample, and to keep using oil analyzers. Very good oil you have in her now.




Thank you. I will either keep using OAI or switching directly to Polaris Labs. Brett from Amsoil (who I worked with for Diesel Power Challenge 2019 and continue with) has recommended to go to 15k and pull a sample. He said everything is looking good and nothing is outstanding that would dictate any issues.


Current Rides:
Toy: 2005 Chevrolet Silverado 2500HD, Duramax Diesel (LLY)
DD/Tow Rig: 2002 Chevrolet Silverado 2500HD, Duramax Diesel (LB7)
Re: Oil Analysis Results for 2002 LB7 Duramax [Re: Bdsankey] #5211595 09/13/19 08:56 AM
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Well looks like I am starting to have a bearing failure. In the last 2000mi there has been a significant drop in oil pressure. This is all running Amsoil AME 15W40 Heavy Duty Diesel Marine. Looks like I'm going to pull the motor out and rebuild it.

2019-09-13_9-45-51.jpg

Current Rides:
Toy: 2005 Chevrolet Silverado 2500HD, Duramax Diesel (LLY)
DD/Tow Rig: 2002 Chevrolet Silverado 2500HD, Duramax Diesel (LB7)
Re: Oil Analysis Results for 2002 LB7 Duramax [Re: Bdsankey] #5212048 09/13/19 07:15 PM
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mattd Online Content
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Certainly looks that way to me. Post some pictures if you can interested to see the nature of the failure. The oil still seems like it go quite a bit more especially with the base number


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Re: Oil Analysis Results for 2002 LB7 Duramax [Re: mattd] #5212414 09/14/19 10:48 AM
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Originally Posted by mattd
Certainly looks that way to me. Post some pictures if you can interested to see the nature of the failure. The oil still seems like it go quite a bit more especially with the base number



Agreed. It took 1qt of makeup at around 9600mi. The oil seems to be wearing extremely well. I don't believe this to be an oil related failure. I do not know any history before ~253k. I am wondering if it got studded because of a head gasket failure pushing coolant into the oil and compromising a bearing. I'm hoping it is a cam bearing. The turbocharger oil supply is off of one of the cam bearings. My theory is (if it is a cam bearing) that when the oil got hot towing it just couldn't provide the necessary lubrication as that has been seen more than once on the duramax platform.


Posting pictures is no problem, I fully intend on tearing it down and repairing it/slight upgrades suited to the nature of towing/longevity (better oil cooler, better piston cooling nozzles, more oil pump flow, upgraded bearings etc).


Current Rides:
Toy: 2005 Chevrolet Silverado 2500HD, Duramax Diesel (LLY)
DD/Tow Rig: 2002 Chevrolet Silverado 2500HD, Duramax Diesel (LB7)
Re: Oil Analysis Results for 2002 LB7 Duramax [Re: Bdsankey] #5244192 10/19/19 12:13 PM
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mattd Online Content
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You had a chance to pull the engine and check things out yet? Just curious.


2007 Ford F-350 4x4 6.0 PSD

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