Just had my change oil light come on at a little over 4000miles 6500ish KM. 2000 Yukon XL 5.3 loaded. Driving is a mix of city (small town and farm) and some highway 50 mile jaunts and a couple of 200 mile plus trips lately. Temps have been around freezing up or down a bit but this oil was put in back in the cold cold winter of Jan. Amsoil ATM 10W30 and Wix filter. I don't think I will bother with a UOA this time round.