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One random failure does not mean they are all going to fail -- but suggesting so is a good way to sell parts and services.
While true, it is also a good preventative maintenance practice to replace them all to keep you from having to go back in, again and again, for glow plug code(s).
Doing repetitive repairs for the same thing gets old after awhile..
Do it once and resolve any possible future issues.
 

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But if only one glowplug was ever going to fail, you 're wasting your time and money.....

It's certainly not like everyone with an LML has been reporting constant glowplug failures. There have been some, and there have been trucks with several.

If they were all failing, we'd have had a policy warranty program on LML glowplugs like the ones for LML NOx sensors and LB7 injectors.
 

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But if only one glowplug was ever going to fail, you 're wasting your time and money.....

It's certainly not like everyone with an LML has been reporting constant glowplug failures. There have been some, and there have been trucks with several.

If they were all failing, we'd have had a policy warranty program on LML glowplugs like the ones for LML NOx sensors and LB7 injectors.
It boils down to a personal choice.......

You're not wasting time or money when you want to keep your truck running smoothly, which keeps you from under the hood, giving you the ability to focus your time on other things in life....
There have not been a lot of constant glow plug failure issues with the Duramax, true... but to keep up on regular wear items keeps you ahead of the repair game down the road...

It's equivalent to tires.
Common sense would dictate that when your tires wear down equally to the indicators and you had a blowout, you wouldn't replace one and claim that you'll be fine because the other tires have plenty of rubber..
You would replace all four tires to:
A. keep you safely on the road
B. keep you from having to stop and changing 3 different blowouts later because your time is more important elsewhere..


Granted, there are some that have fewer means in the world than others and have to get by dealing with one tire at a time because of a hardship...
In time, it will get done.
 

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There is no parallel between replacing consumables like tires and replacing parts that may never fail.

Glowplugs are not a 'consumable' wear item.
 

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There is no parallel between replacing consumables like tires and replacing parts that may never fail.

Glowplugs are not a 'consumable' wear item.
Again, it boils down to a personal choice. Do them all if you want or not....
 
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