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GMC/Chev 6.6L gas engines


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3 hours ago, Oggy said:

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. 

I would love it if Toyota would make a proper 3/4 ton

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On 7/3/2025 at 12:16 PM, 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? 
 

I had the 2024 GMC 2500 AT4X and now have the 2025 GMC 2500 AT4X both with the 6.6 gas.  No issues with plugs or oil in either.

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