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Excessive Oil Consumption & Engine Knock in my 2018 Optima

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Sarah K. · rep 0 · May 25, 2:12 AM · 1 replies · solved · Question

Vehicle: 2018 Kia Optima EX

Hey everyone,

I've got a 2018 Kia Optima EX, and lately, I've noticed a significant increase in oil consumption. I'm having to add a quart or more every 1,000-1,500 miles, which seems way too high for a car with only 70,000 miles on it.

To make matters worse, I've started hearing a subtle but noticeable knocking sound, especially when the engine is cold or under acceleration. I'm really worried this might be related to the engine issues I've heard about with some Kia models. Has anyone else experienced this with their 2018 Optima or similar Kia models? What was your experience with Kia service or warranty claims?

I'm debating whether to take it to the dealer or an independent shop first. Any advice on diagnostics or what to expect would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:12 AM

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ClearTheCode admin answer:

Excessive oil consumption and engine knocking in certain Kia models, including the 2018 Optima, can be a serious concern. This issue is often linked to manufacturing defects in the engine's connecting rod bearings or piston rings, which can lead to premature wear and potential engine failure. A common diagnostic trouble code (DTC) associated with these problems is P1326 (Knock Sensor Detection System Malfunction), which indicates the engine control unit (ECU) has detected abnormal vibrations.

Here's what you should do:

  1. Document Everything: Keep a detailed log of oil additions, including dates, mileage, and the amount of oil added. This will be crucial evidence if you pursue a warranty claim.
  2. Check for Recalls/TSBs: Verify if your specific VIN is affected by any recalls or Technical Service Bulletins (TSBs) related to engine issues or oil consumption. Kia has extended warranties on certain engines due to these problems.
  3. Professional Diagnosis:
    • Dealership First: Given the potential severity and the existence of extended warranties/recalls, your first stop should be a Kia dealership. They have specialized diagnostic tools and are best equipped to handle warranty claims.
    • Engine Inspection: The shop will likely perform an oil consumption test, a bore scope inspection of the cylinders, and check for metal shavings in the oil. They will also scan for DTCs, especially P1326.
    • Connecting Rod Bearing Clearance Test: This is a more invasive test but can definitively diagnose bearing wear.
  4. Understand Your Options: If a defect is confirmed, Kia may offer engine replacement or repair under an extended warranty, even if your original powertrain warranty has expired, depending on the specific recall or settlement terms.

When to See a Shop Immediately: Any persistent knocking, a sudden loss of power, or the illumination of the check engine light (especially with P1326) warrants immediate professional attention. Driving with a severely compromised engine can lead to catastrophic failure, posing a safety risk and significantly increasing repair costs.

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