Oil change intervals have little to do with the quality of the oil today and everything to do with the engine. Older cars that have loosely regulated motors that burn lots of fuel, have big tolerances, and don’t always get up to temp in a quick manner need oil changes more often. Oil change intervals have been stretched so far due to te ability of a computer to precisely regulate air and fuel mixtures as well as the tight tolerances of the motor that contribute to less oil contamination. Change your oil every 3-4 thousand miles on a car built in 1983.
As for oil color-this is not an indication of the condition of the oil. The only way to determine how much life is left in oil is to run an oil analysis, which I encourage people to try if they wish to learn more about their cars.
-Dave G.