https://www.dieselhub.com/specs/6.6l-l8t.html
I don’t feel that I lost any low end torque. The curve on the diesel hub if true shows over 300 ft/lbs with the 6.6 L8T around 1200 rpms. The truck runs good. I would say a modest bump is a good way to explain it. A 5.3 will never get those numbers...
I think I’ll do another UOA in 6 months. Right now I currently run 2500-3000mi per month. I have always just looked for the dexos logo. Harvest king has been easy to find the last year or so at Atwood’s.
Char Baby.
I like the 5k interval personally. I have been changing at 5k intervals for along time know. I like 100k, 105k, 110k etc. Easy to remember. I usually buy it on sale for 11.99 for 5 qts and stock up.