Truck shopping...

[RPOLS3]

I had a 2011 Tahoe with the 5.3/6 speed and a lifter went bad around 160k miles. Mobil 1 and frequent changes since new. Cheaper to put a new short block in it than repair the lifter. Replaced it with a 2018 Yukon Denali with the 6.2 and 10 speed - significantly better drivetrain. Have 154k on that now... Knock on wood no drivetrain issues to date. Can't say enough about the 6.2/10 speed combo, gets 21 MPG on highway and plenty of power.

[Too Many Projects]

Originally Posted by RPOLS3

I had a 2011 Tahoe with the 5.3/6 speed and a lifter went bad around 160k miles. Mobil 1 and frequent changes since new. Cheaper to put a new short block in it than repair the lifter. Replaced it with a 2018 Yukon Denali with the 6.2 and 10 speed - significantly better drivetrain. Have 154k on that now... Knock on wood no drivetrain issues to date. Can't say enough about the 6.2/10 speed combo, gets 21 MPG on highway and plenty of power.

Dang, reading the issues with the 2011 5.3, I'm hoping I'm lucky. 2011 Silverado, 135K and same Mobil 1 10-30 syn and Mobil 1 filters every 5-6k. Plan on trailering the Harley to Tucson in January with it...fingers crossed now.
I'm surprised you are getting 21 with the 6.2. I've always heard they are "thirsty". Must be the 10 speed helping that.