Why does Jeep recommend to change the spark plugs on a 2005 Jeep Liberty at only 30000 miles?
30,000 miles is recommended for spark plug replacement on all
Chrysler/Jeep vehicles, not just the Jeep Liberty. Not only are
plugs recommended at 30,000 miles, shock absorbers are recommended
as well. As a mechanic for the Chrysler/Jeep Corp., i can say with
confidence that it is not entirely necessary to change plugs and
shocks at the 30k mile mark. Basically, "If it ain't broke, don't
fix it!" (however, i do recommend at least checking the plugs at