Jeep WRANGLER 2020 Owner's Manual page 318

316 SERVICING AND MAINTENANCE
Mileage or time passed
(whichever comes first):
Or Years:
Or Kilometers:
Change transfer case fluid if using
your vehicle for any of the following:
police, taxi, fleet, or frequent trailer
towing
Inspect and replace PCV valve if
necessary
Change front and rear axle fluid if
using your vehicle for police, taxi,
fleet, off-road or frequent trailer
towing
1. The spark plug change interval is mileage based only, yearly intervals do not apply.
2. The spark plug change interval is mileage based only, yearly intervals do not apply.
2 3 4 5 6
X
X
7 8 9 10
X
X
11 12 13 14
X
X
15