Oil life?? Time vs. mileage ....

As long as the oil doesn't have any moisture in it (looks Milky) and hasn't turned to dark brown or black it is still good.


Never had Mobil-1 ever show any signs of moisture no matter how long it stays in the engine.

As far as additives go , they don't deteriorate over time , they deteriorate from being used or from contaminates.

Modern oil is a lot more durable .

I change the oil in my hot rod when it just starts to turn from yellow to light brown no matter how many miles are on it.

Now my daily drivers get changed at 5k with mobil-1 or 3k with conventional oil or earlier it the oil has turned black on the stick