My oil is a tan looking color in my 1989 cadillac deville what colud it be

Every cars oil will start to turn color after so many miles it is that today's oils have detergents in them to help clean deposits from inside of the engine.All oils will eventually turn a darker brown.I hope this helps

Thanks for choosing FixYa and welcome. This is a sign of rust in the oil. It gives off that tannish rusty color. Make sure your coolant water is not the same color. If this is the case, it is not ideal. Since it is an older model vehicle, rust might have set up inside somewhere. Some other types of oil may give off this color also. Oil is brown when new and turns black over time.