Was in a co-worker's car last week, a one year old Park Avenue. I noticed the oil life monitor was on the display and read 0. I asked her if the monitor had not been reset after an oil change and she said no that it had just hit zero. From what I recall, the manual says to change the oil within 2 gas fill ups after the oil life monitor reads zero. Correct? Or does it say change oil withing two fill-ups of some other percentage? 40% maybe? In any event, she said that her husband said to pay no attention to the monitor. He told her it could go a while after it reached zero before changing oil. I would guess that he's using a mileage interval of 5-7,500 before having oil changes done. She didn't know. I guess she puts about 12,000 miles per year on a car. She only keeps a car 2-3 years before getting a new one.