Had a new '06 GMC Z71 and just swapped the '10 Silverado Z71 that was bought new. Both were somewheres in the 55,000-60,000 mile range when traded.
Both had the 5.3L aluminum V8. Only the '10 had the "fuel" thingus that cut it back to a V4 when cruising. Zero oil consumption issues with either truck and the '10 went over 6,000 miles several times between oil changes. Straight 5W30 oil, no synthetic.
