how long can this keep going on...?
its been 117000 miles and ive never changed them in the 80000 ive had her, think its a good idea to change my o2 sensors? nobody ever says how long you should go on a pair (theres only 2 on a 4.0, right? thats all i found) have a sneeky suspiction itll help my mileage.
ps- before or after a seafoam treatment? before, right?