If you can CHECK the oil on your car, you can change the WP for free.
25 minutes, TOPS (with the V6, at least.. phew..) and ~$70 for a newer WHITE PLASTIC impellar (stay away from the black plastic impellar..) or pick up a metal one from NAPA.. (~$70.00 as well...)
The how-to is posted under DURATEC MAINTENANCE, pinned at the top..
Ray