Jump to content

GMC/Chev 6.6L gas engines


Recommended Posts

I currently have a 2500HD Silverado with the 6.0L gas engine. It’s been flawless and is a very reliable and proven engine. It has 125,000kms on it and still runs like a top.

 

Im considering upgrading to a new truck but the not the 6.6L gas is offered now. I’ve heard of faulty plugs and some of them needing to add oil constantly due to bad rings and seals. 
 

just wondering if anyone has one, what your experience is, or if anyone knows that maybe these issues have been resolved for MY25? 
 

Link to comment
Share on other sites

Seems like GM is having a difficult time with engines as of late. I’d consider a Ram or Ford for sure!

Link to comment
Share on other sites

45 minutes ago, RAMSOMAIR said:

Seems like GM is having a difficult time with engines as of late. I’d consider a Ram or Ford for sure!

I was looking at ram, but they’re having tranny issues. I know a couple guys that bought new and tranny went around 20,000km

Link to comment
Share on other sites

Searching for problems on the internet is like going to the hospital looking for sick people.    

 

The F250 with the big gas engine is supposed to be pretty solid and actually decent on fuel.   

 

Link to comment
Share on other sites

18 minutes ago, scottyr said:

Searching for problems on the internet is like going to the hospital looking for sick people.    

 

The F250 with the big gas engine is supposed to be pretty solid and actually decent on fuel.   

 

 

 

I have a chum that bought an F350 4wd dually with the 460 big block with flatbed.

 

His numbers are not that far from my 5.9 Cummins (same type) truck. (winter fuel especially)

I think he said 14mpg at 80mph going out west and back, and maybe 9 same trip with a trailer?

 

Just a matter of getting the right gears for your app.

 

I am encouraged that there is an option out there besides a clustered up rattler!

 

.

Link to comment
Share on other sites

8 hours ago, Baylaker said:

I currently have a 2500HD Silverado with the 6.0L gas engine. It’s been flawless and is a very reliable and proven engine. It has 125,000kms on it and still runs like a top.

 

Im considering upgrading to a new truck but the not the 6.6L gas is offered now. I’ve heard of faulty plugs and some of them needing to add oil constantly due to bad rings and seals. 
 

just wondering if anyone has one, what your experience is, or if anyone knows that maybe these issues have been resolved for MY25? 
 

Let me know if you will sell the 2500 private or through dealer..

I'm at 315 on my chevy..

Thanks..Rich..

Link to comment
Share on other sites

8 hours ago, Baylaker said:

I currently have a 2500HD Silverado with the 6.0L gas engine. It’s been flawless and is a very reliable and proven engine. It has 125,000kms on it and still runs like a top.

 

Im considering upgrading to a new truck but the not the 6.6L gas is offered now. I’ve heard of faulty plugs and some of them needing to add oil constantly due to bad rings and seals. 
 

just wondering if anyone has one, what your experience is, or if anyone knows that maybe these issues have been resolved for MY25? 
 

Gm knows about this and has decided to ignore it. They are building new v8 engines in New York for my 2026 and new 2027 redesigned model.  Cant wait to hear more about these new v8 engines. 

Link to comment
Share on other sites

9 hours ago, Strong Farmer said:

Gm knows about this and has decided to ignore it. They are building new v8 engines in New York for my 2026 and new 2027 redesigned model.  Cant wait to hear more about these new v8 engines. 


Great, so GM knows about it and won’t fix it, and now they’re building a new engine that’s going to take 3-4yrs more to get all the bugs out of it? Just wonderful….

 

they should’ve never stopped producing the 6.0L

  • Like 1
Link to comment
Share on other sites

10 hours ago, scottyr said:

Searching for problems on the internet is like going to the hospital looking for sick people.    

 

The F250 with the big gas engine is supposed to be pretty solid and actually decent on fuel.   

 

That’s right, you’re going to find sick people at hospitals and problems on the Internet. 
I want to know of these potential problems before spending $40-$50k to get into a new truck. 
The 4.8. 5.3 and 6.0l engines were all bullet proof engines. I had a 4.8 and beat the piss (worked hard) out of it for 325,000km. They shouldn’t have stopped producing that one either. 

never owned a 5.3 but they were good before they started designing them to shut down to 4cyls. Big problems with that and still ongoing with the new ones.

 

my 6.0L has been flawless and has also been worked its whole life so far. We got the last year of the 6.0L. I’m afraid if we trade it in, I’ll end up with the known 6.6L engine issues, that by the sounds of it, they still haven’t addressed. 
And with the 6.6L only being introduced in 2020, it sounds like they still have some work to do on it.

 

I can’t stand ford, dont like the interior or exterior, im sure they’re solid trucks, just don’t like the looks of them.
 

 

Link to comment
Share on other sites

I've never heard much praise for the 6.0.

Not that I ever heard anyone complain about reliability, but milage.

Everyone I takled to always said that if you needed the power of the 6.0, you may as well git the 8.1.

They both got about the same milage, and the 8.1 had way more power.

 

???

 

 

Come on fella's, you're not really puting much on those motors!

Mr's O typically gits a newer 'Burban at 400K miles, which is over 600K klicks.

I think she's around 340/350 (?) currently, and we just had new bearings / crush sleeve / and even axles put in the rear end.

This is the 3rd rear end we have had to rebuild in a row in the 300K range.

No real issues with the motors. Tranny rebuilt around 225? ($$$ - I didn't doo that one myself)

 

I'm currently running a '99 Burban with the last of the 350's.

I think it's around 275K miles right now.

It was a North Carolina truck.

A bit faded, but rust free. 

 

 

.

Link to comment
Share on other sites

Usually you hear the bad on the interwebs, people rarely come online to post the good and just carry on with their day. 
Just like the bias towards the other manufactures, case in point, people still think Chrysler has tranny issues…never had one issue yet. 
I know I have a bias towards GM, but I had a rented truck the other month and thought it was a great truck, albeit a newer one.

I think all three have their strengths and weakness’, pick your poison and hope for the best. 
As for not fixing a problem that is well known, IDK about that, does it happen, sure, but it gets blown out of proportion IMO when some folks have a bad experience that perhaps was not handled well by a dealer or competent mechanic.

 

If you can, try and talk to people you see on the road that has the truck or product you are interested in, most are happy to share their thoughts that you won’t see online. 

  • Like 2
Link to comment
Share on other sites

35 minutes ago, stoney said:

Usually you hear the bad on the interwebs, people rarely come online to post the good and just carry on with their day. 
Just like the bias towards the other manufactures, case in point, people still think Chrysler has tranny issues…never had one issue yet. 
I know I have a bias towards GM, but I had a rented truck the other month and thought it was a great truck, albeit a newer one.

I think all three have their strengths and weakness’, pick your poison and hope for the best. 
As for not fixing a problem that is well known, IDK about that, does it happen, sure, but it gets blown out of proportion IMO when some folks have a bad experience that perhaps was not handled well by a dealer or competent mechanic.

 

If you can, try and talk to people you see on the road that has the truck or product you are interested in, most are happy to share their thoughts that you won’t see online. 

 

Blatantly ignoring a "well known" problem - resulting in numerous failures and customers left holding the bag = class action and punitive damages.

There are many reasons for "problems" 

  • Like 2
Link to comment
Share on other sites

I have a 2020 F250 with the Godzilla motor.  So far it works pretty good, no problems with it.  

  • Like 1
Link to comment
Share on other sites

6 hours ago, Baylaker said:


Great, so GM knows about it and won’t fix it, and now they’re building a new engine that’s going to take 3-4yrs more to get all the bugs out of it? Just wonderful….

 

they should’ve never stopped producing the 6.0L

We see, I think new engines will be much simpler they claim. Fuel management system was issues too on smaller v8's. I am still driving my 2010 Silverado. Most likely keep it until it's dead. It's very easy to work on and doesn't have all those fancy systems. My mechanic said he buy it off me in a second. He drives an 2003 for similar reasons. Has 450 k kms on iT. 
Best motor seems to be 3.0 L diesel. I just wouldn't get first version of it. Second version they fixed all flaws 👌

Link to comment
Share on other sites

Just an FYI. If you dont need a HD. Buy the baby duramax. Mine is phenomenal with fuel consumption (better than most cars) and It will pull a hell of a lot

  • Like 2
Link to comment
Share on other sites

2 hours ago, mach Z said:

Just an FYI. If you dont need a HD. Buy the baby duramax. Mine is phenomenal with fuel consumption (better than most cars) and It will pull a hell of a lot

I need a 3/4 ton for work. But I have decided to keep my 6.0L 

 

I know a guy that has one of those 3.0L diesel’s and it’s phenomenal on fuel. I wish I could say the same about my truck lol

  • Like 1
Link to comment
Share on other sites

32 minutes ago, Baylaker said:

I need a 3/4 ton for work. But I have decided to keep my 6.0L 

 

I know a guy that has one of those 3.0L diesel’s and it’s phenomenal on fuel. I wish I could say the same about my truck lol

Ya, my 6.4 in the dodge ain’t winning no fuel mileage competitions, but what is in a 3/4 ton truck. 
It’s pretty crazy the difference between a 1/2 truck and a HD truck.

  • Like 1
Link to comment
Share on other sites

19 minutes ago, RAMSOMAIR said:

Getting 20-21mpg hwy with my 2022 Ram 2500 Cummins MegaCab. 30,000kms on the ODO. 

That’s a diesel - talking about gassers in the HD series and their wonderful fuel mileage. 
I’m not complaining, just the way it is. 

Link to comment
Share on other sites

10 hours ago, stoney said:

Ya, my 6.4 in the dodge ain’t winning no fuel mileage competitions, but what is in a 3/4 ton truck. 
It’s pretty crazy the difference between a 1/2 truck and a HD truck.

Yes, definitely the loser for mileage.

mine is ok if I’m not towing, it’s when I’m hauling around 5-6ton is when it starts to get a little thirsty. 
 

 

 

Link to comment
Share on other sites

21 hours ago, Ox said:

I've never heard much praise for the 6.0.

Not that I ever heard anyone complain about reliability, but milage.

Everyone I takled to always said that if you needed the power of the 6.0, you may as well git the 8.1.

They both got about the same milage, and the 8.1 had way more power.

 

???

 

 

Come on fella's, you're not really puting much on those motors!

Mr's O typically gits a newer 'Burban at 400K miles, which is over 600K klicks.

I think she's around 340/350 (?) currently, and we just had new bearings / crush sleeve / and even axles put in the rear end.

This is the 3rd rear end we have had to rebuild in a row in the 300K range.

No real issues with the motors. Tranny rebuilt around 225? ($$$ - I didn't doo that one myself)

 

I'm currently running a '99 Burban with the last of the 350's.

I think it's around 275K miles right now.

It was a North Carolina truck.

A bit faded, but rust free. 

 

 

.

The 6.0L is a very reliable, been refined over the years and has proven to be a solid winner. I’m sure some people have had problems with them, but for the most part the engine just works.

Definitely not a winner in the mileage department, but what big block is?

 

Link to comment
Share on other sites

8 hours ago, Baylaker said:

Yes, definitely the loser for mileage.

mine is ok if I’m not towing, it’s when I’m hauling around 5-6ton is when it starts to get a little thirsty. 
 

 

 

What would you get empty driving down the highway. 14 ish L per 100? 

Link to comment
Share on other sites

6 hours ago, Strong Farmer said:

What would you get empty driving down the highway. 14 ish L per 100? 

I had one of the 1500HDs years ago with a 6.0L and it was absolutely brutal on fuel.     I bet 18L/100kms empty would be very optimistic.   

 

 

Link to comment
Share on other sites

17 hours ago, Strong Farmer said:

What would you get empty driving down the highway. 14 ish L per 100? 

Ya around there, my best was 13L per 100

 

it gets cut in half at a minimum when towing heavy, but man does it ever tow nice!

  • Thanks 1
Link to comment
Share on other sites

Depends are what you are doing with it but a low mile pre 2022 Tundra would my pick. They are built heavier than a traditional 1500 and last. I'm a fleet mechanic and see them all.  Newer engines have issues, mainly because of government emissions standards. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...