i am the manager of a quick lube oil change co. called
OIL CAN HENRY'S, and if you didn't know already, your 98-00 contour is equiped w/ a Cabin Air Filter, these filters filter the air when you turn on your ac/and heater,
service interval is every 20,000 miles. 98 and up Tarus has them too, you wouldn't beleave the Nasty CAF's i see all the time , check yours if you havent already you might be suprised,