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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ, LMM & LML engine specific topics.

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Old 08-14-2017, 11:15 AM
gary_lucas's Avatar
gary_lucas gary_lucas is offline
Join Date: May 2012
Location: Langley
Posts: 372

Originally Posted by socaltoolguy View Post
Thanks to all of you who took the time to reply. So, from what I'm gathering, I don't really have much to worry about with an LLY motor. That's great. Now all I have to do is find a truck that I can afford. One more question, At what point should miles become a factor? I realize that maintenance plays a huge roll but I am seeing a lot of trucks for sale with 175k to 200k miles. When I sold our truck it only had 70k on it. I was told that it wasn't even broken in yet. So, at what point should I say, "too many miles"?

I don't think this is specific to an LLY, it's legitimate advice for any vehicle. But most vehicles aren't 5-8k to replace head gaskets on.

The only piece of advice I'd give is watch out for overheat / radiator clogged up on the air side.

I have an LLY and had an overheat problem:

That was the cause, but it's not that easy to check. At this stage I pull it out every 2nd year and take a look.

I did need my head gaskets done and I'm pretty sure this was the cause.
GMC Sierra 2500hd 2004.5 now with ARP studs
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Old 08-14-2017, 11:24 AM
socaltoolguy socaltoolguy is offline
Join Date: Jul 2002
Location: Huntington Beach, Ca.
Posts: 72

Wow Gary. I looked at your pic of your radiator and I can see why you had an overheating problem. I've never seen a radiator that messed up. You must travel some crappy roads is all I can say. I had my 2001 and sold it in 2011. It had 75k on it and my radiator was clean. I will say though that I used to keep an eye on it. I figured if the front of the oil cooler and a/c condenser was clean, the radiator would also be clean. Thanks for your comment. I appreciate it.

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Old 08-14-2017, 06:39 PM
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a5150nut a5150nut is offline
Join Date: Jan 2001
Location: Knoxville,Tennessee
Posts: 2,188


Those photos remind me of my old 74 350 3/4 ton running between San Jose and Paradise going through the Sacramento valley rice fields. The front of the truck would look like green fur when I got home. And for only coming home on the weekends the birds would swarm it as soon as I parked. I ran black nylon screen behind the grill and what didn't fall off the birds would remove for me.
"The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government."
-Patrick Henry

2006 K3500 D/A
94 6.5 4x4 5spd Sold
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