What would be considered a "newer car"?It's not needed with newer cars. The computer will actually set lots of faults if it is wearing out. You can have your dealer run a test and give you the actual reading and the specified reading just so you have an idea. If one cylinder is muchlower or higher than the other, I would suspect a problem. A much higher reading indicates oil rings have failed. A much lower reading indicates a valve leaking, EXTREME scoring, or bore wear.