Grand Cherokee Oil Life Monitor

Just the latest idiot light...

I've never trusted any of them...usually they tell after it's too late to do anything about it

My daily driver (Honda Fit) has the countdown oil minder based on a percentage.
Seems to go about 7000 miles from 100% down to about 10%, but almost all my miles are highway, so I change it when it gets to about 50% (using Dino).
I still put the little piece of paper with the mileage and date of the oil change in the engine compartment (or on the window of the filter offers a sticker, which some now do:))

I try not to trust the gauges....as I found out, when I was sitting on the side of the road, showing about 1/3 of a tank of gas....calling AAA, only to realize that I'd driven about 450 miles, and had just run out of gas.:S Now, I reset the odometer and stop for gas when I get to 300 miles. The gas gauge does go back up to FULL when I fill up, and will drop as I drive, but seems to stop about 1/3 tank....so I don't trust them.
Oh, and Honda won't fix it (under warranty), because it's "working".....even if not correctly...LOL!!

On all of my vehicles, the computer will calculate oil life by taking into account the type of driving you are doing, engine load, etc. but I don't think it has the capability to determine synthetic v Dino oil. I usually get about 7k on my daily driver.

It does not know the type of oil. The oil life is determined by how the engine is used. Towing, temperature extremes, and hours are factors.

No probably what's happened to yours is like mine - It just quits working after a couple of years. Couldn't see spending the money to fix it either. Usually have a sticker on the windshield to remind me anyway.