I run Mobile 1 and am gonna follow the 5K mile recommended service interval.
I've only done one oil change on the truck so far and just looked at it after about 3500 miles and it looks dark as to be expected, but not enough to make me change it now. Besides that.....it's cold outside. Hopefully when the 5K mark comes -it'll be sometime next month and a little warmer.
I've always followed recommended oil changes and always keep an eye on the oil inbetween, not only for coloration, but for oil level, and other mysterious things that could occur. Makes me feel better knowing I check it often.
Ya know - (sorry, off topic), I don't open my hood up very often but when I do, I absolutely LOVE the hood struts. They are soooo damn nice!! If you don't already have some...you gotta get 'em. (I have the C2C variety).