Jeep WRANGLER 2023 Owner's Manual page 299

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Mileage Or Time Passed (Whichever Comes
Or Years:
Or Kilometers:
Replace Spark Plugs – 2.0L Engine. **
Replace spark plugs – 3.6L Engine. **
Flush and replace the engine, intercooler
(if equipped) coolant at 10 years or
150,000 miles (240,000 km) whichever
comes first.
Change the manual transmission fluid if
using your vehicle for any of the following:
trailer towing, snow plowing, heavy loading,
taxi, police, delivery service (commercial
service), off-road, desert operation or more
than 50% of your driving is at sustained
high speeds during hot weather, above
90°F (32°C).
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.
** The spark plug change interval is mileage based only; yearly intervals do not apply.
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SERVICING AND MAINTENANCE
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297
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