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High Mileage Club for the 5.3 and 6.2

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39 minutes ago, SuperOldSchool said:

Isn’t this a high mileage thread?


Why are folks just posting their current  mileage, being well under even 100k?


my 2015 XL Denali has 117k on it.  Trans was replaced at 14k , so it alone has about 100k on it.



You're in the wrong sub-forum buddy. This is for 2019-21 Silverados, which is why the mileage is so low.


My 2020 stock TrailBoss LT w/ 5.3L & 10Spd has 35K trouble-free miles. Nothing wrong with the truck at all, only had it in for oil-changes and tire rotation. Looking forward to getting it over 100K miles and seeing how it compares to my old 2012 F150 Ecoturd that was in bad shape at that many miles.

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  • 6 months later...

2019 z71 5.3L 8l90 


new transmission valve body at 59k miles. 
Serpentine belt and pulley both failed at around 30k

current mileage is 73k miles 

Superchips Tuned DFM OFF.
doesn't burn oil anymore after DFM shut off. 

8l90 thermostat deleted. 
Amsoil Fluids bumper to bumper expect engine oil. Because I change it every 5k. 


Drives and shifts better new at 73k miles. Weird. Expect for the occasional clunk I get when going into REVERSE from any gear since 0 miles. Maybe the driveshaft needs lube idk.

Edited by 11bravoZ71
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Had 64K on 19 6.2 HC, oil cooler line leak, muffler rattle and the 7 or 8 recalls it had but no lifter/motor issue.  Always made noise at startup when cold motor from day one, new 23 6.2 has yet to make that noise.

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On 2/20/2022 at 7:41 PM, 1454 said:

How many until failure? Or just how many miles currently? 


No failure (knock on wood), 22,500 miles, 2021 6.2. Purchased last March/April. 

30,800 miles, cylinder 7 lifter decided to commit suicide. 


Spoke too soon. Does anyone know if there are higher quality aftermarket replacements? God knows I don't want to deal with this again. 

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