On Fri, 03 Oct 2008 16:27:06 -0400, Kurt Ullman <kurtullman@yahoo.com>
wrote Re Oil change time or mileage?:

> Which is more important. My kid just informed me that she hasn't
>changed the oil in roughly a year, yet she hasn't put enough miles on it
>according to the sticker. Going forward should she pay more attention
>to time (and how long) or the mileage?
>
>It is for an 00 Explorer

Mileage. Actually, total cumulative engine revolutions since last oil
change is what is important. But mileage is a close enough
approximation.