Excessive Oil Consumption in 2018 Jeep Cherokee 2.4L Tigershark

ClearTheCode admin answer:

Your experience with excessive oil consumption in your 2018 Jeep Cherokee 2.4L Tigershark engine is unfortunately a well-documented issue. This engine, particularly in earlier model years, has been known to consume oil at a higher rate than expected, often due to design characteristics related to the piston rings and PCV (Positive Crankcase Ventilation) system.

Here are the common causes and steps to address it:

1. Piston Ring Design: The primary suspected cause is the design of the low-tension piston rings, which can allow oil to bypass into the combustion chamber, especially under certain driving conditions. Over time, carbon buildup can also cause these rings to stick, worsening the issue.
2. PCV System: A faulty or clogged PCV valve or system can lead to increased crankcase pressure, forcing oil past the piston rings or seals. While less common than the piston ring issue, it's worth checking.
3. Valve Stem Seals: Worn valve stem seals can also contribute to oil burning, though this is typically more prevalent in higher mileage engines.
4. Software Updates: In some cases, engine control module (ECM) software updates have been released to modify fuel delivery and ignition timing, which can sometimes indirectly help mitigate oil consumption by reducing carbon buildup.
5. Oil Consumption Test: Dealerships often perform an official oil consumption test. This involves topping off the oil, sealing the dipstick and oil fill cap, and having you return after a specified mileage (e.g., 1,000-1,500 miles) to measure the actual consumption. This is usually required for warranty claims or extended warranty repairs.

When to See a Shop:

• Immediately: If you notice any warning lights (like the check engine light or low oil pressure light), hear unusual engine noises, or see blue smoke from the exhaust, get it to a shop right away. These could indicate more severe engine damage.
• Soon: Given the consistent need to add oil, it's crucial to have a certified Jeep technician diagnose this. They can perform the official oil consumption test and check for any applicable TSBs or extended warranty programs related to the 2.4L Tigershark engine. There have been extended warranties and recall campaigns (e.g., for PCV valve replacement) for certain model years related to this issue.

Potential OBD codes might include P030x (misfire codes) if spark plugs are fouled by oil, or P0520 (Engine Oil Pressure Sensor/Switch Circuit Malfunction) if oil levels get critically low.