Switch from 5w20 to 10w30 syn.

Results continue to impress, at 4200kms, oil is just starting to change color, considerable difference vs just over 1000kms and jet black with 5w20 in the pan. Opposite to what I was expecting, cylinder deactivation comes in easier / earlier and stays in a hair longer when you accelerate. The 10.3ltr/100 going to the track was also on 10w30 so no mileage did not drop off (at least in mine) as so many claim with heavier oil.
I saw exact same results in my former 5.3 GM plus took it from chugging a ltr of oil every 22-2500kms to using zero in between it's 5000km oil changes.