Does anyone know the exact failure mechanism of the lifters?

[Joeltz]

I've got almost 24k on my 2021 with no problems, but I typically run 150k+ miles between trucks. Has there been any actual info on what is failing and if we as owners can do anything to help prevent it?

These new trucks are calling for 0-20 oil which is super light, especially in hot weather and towing. Most likely so light to squeak out 0.001 MPG, probably at the long term expense of the engine. Maybe slightly heavier oil grades in the summer would be advantageous and provide better mechanical wear resistance? FYI, the 2020 6.2 calls for 5-20.

I'd love to know what's truly happening to feel better about long term ownership on this one.

Here is what my lifter did … it Stuck in DOD…. Dead on Demand…. A Texas speed Dod removal kit… Cam and lifters and plugs for the Dod. AND a Dyno Tune Emm reprogram !!! See 24 mpg at 67 now.

 

[Bob2C]

I am a firm believer in more frequent oil changes as a strong preventative measure. I notice less noise overall going to ~50% on the OE system wear number.

3-4k mile intervals for me. I have seen YouTube videos where the bad lifters were caked up which leads me to believe poor maintenance. Once those small oil ports get clogged. Game over. I also run either amsoil or liqui Molly engine flush every 10k or so. I know some here would cringe at a flush but I think it’s harmless. I also tuned out AFM. Is all this going to prevent failure, who knows but at least it’s something. Some never have an issue and just drive their vehicles. I guess part of is luck too

 

[DCRich]

There’s a TSB out that talks about how the bad lifters could be in vehicles built between Sept 2020 and March 2021.

Mine was built March 19th and so far no issues although I’m almost to 5,000 miles. Sounds like most fail between 5-12k miles.

My Tahoe was built end of March 2021 and the dreadful ticking noise and misfiring just occurred three days ago at 6,300 miles. Hopefully, you do not have the same result.

 

[Micahsd]

My Tahoe was built end of March 2021 and the dreadful ticking noise and misfiring just occurred three days ago at 6,300 miles. Hopefully, you do not have the same result.

Ugh…that’s sucks.

Good luck with the repairs. Hopefully it goes well.