I put about 7500/yr on my Dodge Cummins. I change it once a year so it's right on the the recommendation. It also has a computerized monitor that warns me when a change is due. supposedly it monitors engine revs, miles, acceleration, and all sorts of other stuff to decide when it's due. Since I've had it, I've never been warned.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.