2018 Jeep Grand Cherokee Maintenance Schedule
The 2018 Jeep Grand Cherokee is a capable mid-size SUV available with three distinct powerplants, each with slightly different service intervals and failure modes. This schedule covers all three engines and addresses the WK2's known weak points: transmission issues on the 8-speed automatic, water intrusion in door seals, and premature brake wear due to weight and off-road use.
Service Intervals
| Service | Interval | Est. Cost |
|---|---|---|
| Engine Oil & FilterJeep recommends 10,000-mile maximum intervals; use the correct grade (0W-20 for the 3.6L Pentastar, 5W-20 for the 5.7L HEMI, 5W-40 for the 3.0L EcoDiesel) to avoid sludge buildup. | 10,000 mi / 12 mo | $40–$75 |
| Tire RotationRotate every oil change; the WK2's weight distribution and off-road capability can cause uneven wear, especially on the front tires. | 10,000 mi | $25–$50 |
| Engine Air FilterReplace every 30,000 miles or sooner if driving in dusty/off-road conditions; a clogged filter reduces fuel economy and power on the V6 and V8. | 30,000 mi | $30–$60 |
| Cabin Air FilterReplace every 15,000 miles or annually; the WK2's cabin can accumulate dust quickly, especially if used for off-roading. | 15,000 mi | $25–$50 |
| Brake FluidFlush and replace every 2 years regardless of mileage; brake fluid absorbs moisture and degrades, critical for the WK2's heavy braking demands. | 24 mo | $100–$150 |
| Brake Pads & Rotor InspectionInspect every 20,000 miles; the WK2's curb weight (4,600+ lbs) causes accelerated pad and rotor wear, especially with towing or frequent braking. | 20,000 mi | $150–$300 (pads only); $300–$600 (pads + rotors) |
| CoolantReplace at 102,000 miles or 10 years; Jeep uses a long-life coolant, but the Pentastar V6 is prone to corrosion if intervals are exceeded. | 102,000 mi | $120–$200 |
| Transmission Fluid (8-Speed Automatic)Drain and refill every 60,000 miles for all three engines; the 8-speed automatic is known for shuddering and delayed shifts if fluid is neglected. | 60,000 mi | $150–$250 |
| Spark Plugs (Pentastar/HEMI only)Replace at 100,000 miles on the 3.6L Pentastar V6 and 5.7L HEMI V8, which use long-life iridium plugs. The 3.0L EcoDiesel V6 is a compression-ignition engine and does not use spark plugs. | 100,000 mi | $100–$200 |
| Differential Fluid (AWD/4WD)Change every 50,000 miles if towing or off-roading; the WK2's full-time AWD and available 4WD systems generate heat and require fresh fluid for longevity. | 50,000 mi | $80–$150 |
| Transfer Case Fluid (4WD models)Change every 60,000 miles on 4WD models; neglect can cause grinding noises and eventual failure of the transfer case. | 60,000 mi | $100–$180 |
| BatteryInspect at 5 years; replace if voltage drops below 12.4V or if starting becomes sluggish; the WK2's electrical systems are power-hungry. | 60 mo | $150–$250 |
| Serpentine BeltReplace at 120,000 miles or if cracking is visible; the Pentastar V6 is sensitive to belt tension and misalignment. | 120,000 mi | $150–$300 |
2018 Jeep Grand Cherokee Oil Change Interval
The 2018 Jeep Grand Cherokee oil change interval is every 10,000 miles or 12 months, whichever comes first (estimated cost $40–$75). Jeep recommends 10,000-mile maximum intervals; use the correct grade (0W-20 for the 3.6L Pentastar, 5W-20 for the 5.7L HEMI, 5W-40 for the 3.0L EcoDiesel) to avoid sludge buildup.
What Happens If You Skip It
- Skipping transmission fluid changes leads to shuddering, delayed shifts, and eventual transmission failure (common at 100,000+ miles on neglected units).
- Ignoring brake fluid flushes causes moisture accumulation, reducing braking effectiveness and increasing the risk of brake failure on downhill grades.
- Neglecting differential fluid changes on AWD/4WD models causes premature wear of gears and bearings, resulting in whining noises and loss of traction.
- Delaying spark plug replacement on the Pentastar V6 causes rough idle, misfires, and reduced fuel economy due to carbon buildup.
- Skipping coolant flushes on the Pentastar allows corrosion inside the engine block, leading to overheating and potential head gasket failure.
- Ignoring brake pad wear accelerates rotor damage, turning a $200 pad replacement into a $600+ rotor and pad job.
Common Issues at Higher Mileage — 2018 Jeep Grand Cherokee
8-speed automatic transmission shuddering and delayed shifts; caused by worn transmission fluid and internal wear; requires fluid change or transmission rebuild ($2,000–$4,000).
Pentastar V6 coolant leaks from the water pump or heater core; corrosion and age weaken seals; repair costs $300–$800.
Brake rotor warping and pad glazing due to heavy weight and frequent braking; causes pulsation and reduced stopping power; requires rotor replacement.
Door seal degradation allows water intrusion into door panels and window regulators; causes electrical shorts and window motor failure; prevention is key (seal inspection every 50,000 miles).
Serpentine belt fraying and cracking; failure can leave you stranded; replace proactively at 120,000 miles to avoid alternator and water pump damage.
FAQ
How often does a 2018 Jeep Grand Cherokee need an oil change?
The 2018 Jeep Grand Cherokee oil change interval is every 10,000 miles or 12 months, whichever comes first (estimated cost $40–$75). Jeep recommends 10,000-mile maximum intervals; use the correct grade (0W-20 for the 3.6L Pentastar, 5W-20 for the 5.7L HEMI, 5W-40 for the 3.0L EcoDiesel) to avoid sludge buildup.
What maintenance does a 2018 Jeep Grand Cherokee need?
The most important 2018 Jeep Grand Cherokee services: engine oil & filter every 10,000 mi / 12 mo; tire rotation every 10,000 mi; brake fluid every 24 mo; brake pads & rotor inspection every 20,000 mi; transmission fluid (8-speed automatic) every 60,000 mi. See the full intervals table above for every service with estimated costs.
What are common Jeep Grand Cherokee problems at higher mileage?
80,000–120,000 mi: 8-speed automatic transmission shuddering and delayed shifts; caused by worn transmission fluid and internal wear; requires fluid change or transmission rebuild ($2,000–$4,000). 100,000+ mi: Pentastar V6 coolant leaks from the water pump or heater core; corrosion and age weaken seals; repair costs $300–$800. 90,000–130,000 mi: Brake rotor warping and pad glazing due to heavy weight and frequent braking; causes pulsation and reduced stopping power; requires rotor replacement. 110,000+ mi: Door seal degradation allows water intrusion into door panels and window regulators; causes electrical shorts and window motor failure; prevention is key (seal inspection every 50,000 miles). 120,000+ mi: Serpentine belt fraying and cracking; failure can leave you stranded; replace proactively at 120,000 miles to avoid alternator and water pump damage.
