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Old 08-01-2023, 08:25 PM   #1
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Advice on a 2006 Silverado LBZ 6.6T Diesel

So I am helping a friend sell a 2006 Silverado HD LBZ 6.6T Allison transmission with 148000 miles on it as part of settling an estate.

It had been sitting for 6 months but after I installed fresh batteries it fired right up and drove very smoothly.

The previous owner who passed away bought it new.

Body is near perfect other than a single paint scratch and one minor ding.

Great Carfax with no accidents and regular maintenance.

So, I like the truck so much I may buy it and sell my Canyon. No more pushing the payload limit. But it is 12 years older and 100,000 more miles.

MPG daily driving and towing probably similar.

If we do sell it will list it here and bringatrailer. I have learned the 2006-2007 LBZ with Allison transmission is highly desirable so should sell easily at a good price.

Should I keep it? What do y'all think?
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Old 08-01-2023, 08:57 PM   #2
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I don’t know a thing about them but a quick google search shows they’re “highly valued and sought after”. If it has been properly maintained and the price is fair I’d buy it if I was in the market for another HD truck. (I’m a Ram/Cummins guy but that Duramax/Allison combo has a good reputation.)
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Old 08-01-2023, 10:29 PM   #3
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A good review:

https://www.xtremediesel.com/blog/20...-buyers-guide/
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Old 08-02-2023, 06:48 AM   #4
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I have a 2003 with 120k - it is starting to rust away from Michigan road salt. I'd buy another one in a heartbeat if I could. More than enough power and torque for my needs and new truck's are very expensive.

If you decidide to sell it let me know, I'd like a little more information.

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Old 08-02-2023, 06:55 AM   #5
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It certainly sounds like a unique opportunity. Can you have it inspected by a mechanic prior to purchase?
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Old 08-02-2023, 07:38 AM   #6
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One of the best Duramax models made! Lots of power, no DEF, no regen problems, and lots of parts available if needed. If the price is right, buy it!
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Old 08-02-2023, 07:45 AM   #7
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Hello friend! I wouldn’t be concerned at all about the years or the miles with the exception of the life expectancy of the motor, and the cost of major repairs. Another question, and more related to your personal circumstances, is whether or not the substantial increase in bulk will be an issue around town.

And, you omitted the most important consideration: what color is it?!
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Old 08-02-2023, 07:58 AM   #8
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Quote:
Originally Posted by Dennis C View Post
It certainly sounds like a unique opportunity. Can you have it inspected by a mechanic prior to purchase?
Yes, in fact it is at a very good local shop right now for a "30 point inspection".

Getting a quote for:
-New water pump (they apparently are good for 150,000-200,000 miles so I think good to replace it now.
-One window lift is inoperable.

The truck has followed the previous owner from California to Las Vegas to Austin Texas, so no rust issues (I thought GM fixed that way back in the 1980's so surprised to hear that era would have any potential rust issues, but I guess road salt will rust anything).

The truck is unmodified (no tune or aftermarket, even exhaust is stock).

The bed is Line-X'd and is in great shape so I think he never hauled anything heavy or abrasive.

Still undecided, but need time to clear the title anyway. Either way glad his sister will get something out of the deal whatever it ends up being.
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Old 08-02-2023, 08:12 AM   #9
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Rust free and one owner? I wouldn't pass that truck up if it's priced right.
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Old 08-02-2023, 08:47 AM   #10
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Originally Posted by field & stream View Post
Hello friend! I wouldn’t be concerned at all about the years or the miles with the exception of the life expectancy of the motor, and the cost of major repairs. Another question, and more related to your personal circumstances, is whether or not the substantial increase in bulk will be an issue around town.

And, you omitted the most important consideration: what color is it?!
As shown above it is black. Perhaps not the best choice for Texas LOL !
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Old 08-02-2023, 08:51 AM   #11
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That’s a looong truck, will it fit in your garage? I had to extend my garage 4’ to fit my Yukon XL and a workbench on the back wall.
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Old 08-02-2023, 09:31 AM   #12
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I picked up a AS with a 2002 2500HD with 71K miles on it. No use for a diesel is a concern, but this seller was anal about oil changes and starting it once a week and ringing it up to temp. It now has 78K miles on it and I regular.y start it. There is a term “lot rot” directed at turbo sitting and collecting moisture due to temp changes. That would be my only concern with your truck!
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Old 08-02-2023, 10:11 AM   #13
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That’s a keeper!

I have the same truck, bought new. About the same mileage. Only have had minor issues; fuel filter replacement ( easy fix, Amazon), front wheel bearings replaced and both rear window motors replaced (easy fix, Amazon and a YouTube). The one thing I will share that a mechanic told me: drive it like you stole it. In other words keep it blowed out! Keep the oil changed regularly and it will last a long long time! Good luck!!😎
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Old 08-02-2023, 02:09 PM   #14
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I think you should buy it. I’ll check it out in person at COTA in October.
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Old 08-02-2023, 03:19 PM   #15
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I think you should buy it. I’ll check it out in person at COTA in October.
Awesome LOL Get to check out your new class A too!

So inspection completed and some work will be done right away:

-Glow plug #4 bad which is why check engine light was on.
Surprised at that because it had all new glow plugs at 90,000 miles.

-Two new window regulators.

-New fuel filter/water separator.

-Oil and Filter change Rotella 15w-40 (based on the Carfax and oil appearance this is way early but it also sat for 6 months)

Recommended but holding off for further consideration:

-New tires (old are aged out)

-New Pitman arm, Idler arm, lower ball joints.
Drives fine, so no symptoms but apparently measurement shows it is time to replace.

-Hydro boost unit.
Has slight leak so good idea to replace it and I would do hoses also. Of course a brake system flush too.

-Drivers seat leather cover.

So, if I keep it I will be having all this done. If we sell it that is where the decision comes in.

Do we sell as is with disclosure of "recommended" repairs or..... do all recommended items and have a starting bid that includes cost of repairs (which will have a 12 month warranty parts and labor) ?

A question for you diesel folks. This truck sat in a driveway for 6 months with a nearly full fuel tank. It seemed to run super smooth so is it safe to assume the diesel is fine? Would an additive be a good idea or too late for that?
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Old 08-02-2023, 03:24 PM   #16
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Get the work done, put in a can of diesel conditioner, buy it and enjoy!!
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Old 08-02-2023, 03:27 PM   #17
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Originally Posted by Chief Gill View Post
I have the same truck, bought new. About the same mileage. Only have had minor issues......................... The one thing I will share that a mechanic told me: drive it like you stole it. In other words keep it blowed out! Keep the oil changed regularly and it will last a long long time! Good luck!!😎
Thanks, I have read that also and it apparently has to do with the turbo blades getting "coked up" if you don't spin it up and heat it up often enough. Not just the Duramax, this is apparently a potential issue on many Fords and probably others too. With all that available torque, it probbaly does not get much exercise in day to day driving, so yeah open it up. A friend who was a Ferrari mechanic did that as the first part of a "tune up".
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Old 08-02-2023, 03:42 PM   #18
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I wouldn’t worry about the diesel sitting for six months. It’s awesome that it’s a pre-DEF engine. If it was a DEF engine, then sitting for extended periods of time is a bigger issue.
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Old 08-02-2023, 04:09 PM   #19
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Sounds like a keeper to me.
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Old 08-02-2023, 04:52 PM   #20
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I would definitely fill the tank with new diesel and an additive that will remove water.


Hot Shots Diesel Extreme is very popular.

The worst enemy of a diesel engine is not the emissions as many would argue but bad fuel (water is the worst) followed by excessive idling.

If you are keeping it, I read that an aftermarket lift pump is one of the best mods for that truck. Relying on the injection pump to prime the system can cause failure.
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