I just purchased my wife a 2000 Olds Bravada and changed the oil as soon as we got it even though it was not black. Now I am running Mobil clean 5000 with a Napa gold filter. I plan on doing oil changes every 5000 but I just checked the oil after 4000 and it still looks almost new? Now is this good or bad? Can I go 6000 miles between changes? All my other vehicles I have ever owned the oil was black after 3000 miles. I was always told that this was good because it means the oil is is catching all the [censored] and suspending the particles? So if after 4000 miles if the oil looks almost new does that just mean that this motor is running really clean and not producing as much carbon and other harmful deposits? I bought this from a Doctor, it was his wifes truck and they always changed the oil at Valvoline every 3000 miles. It had 96,000 on it when I bought it and now it is at 100K. After 4000 miles it has not used a drop of oil.