2017 Kia Optima: excessive oil consumption

Filed Nov 8, 2026 · Engine · NJ

My 2017 Kia Optima LX with the 2.4L Theta II GDI engine has repeated engine misfires caused by oil-fouled spark plugs. The engine burns 1 to 2 quarts of oil every week on only 200 to 250 miles of driving, 4 to 10 quarts per 1,000 miles, far above the 1 quart per 1,000 miles threshold in Kia’s own TSB ENG222. Every time the spark plugs are removed, they are coated with oil. Cylinder #4 has misfired three times in five months (June 5, August, and November 2026), and cylinders #2 and #3 misfired on June 17, 2026. All four ignition coils and spark plugs were replaced in August 2026, and the #4 misfire returned within about three months. We have paid out of pocket for repeated repairs since January 2025. The KSDS update was installed at a Kia dealer. The vehicle is now unsafe to drive because misfires can cause sudden loss of power at highway speed, and running low on oil risks engine bearing damage and seizure. We have taken it out of service. I have written to Kia America’s executives requesting diagnosis under TSB ENG222 and repair under the Theta II settlement’s lifetime warranty. I am asking the federal safety agency to investigate excessive oil consumption and repeated oil-fouled spark plug misfires in Theta II 2.4L GDI engines in 2016–2020 Kia Optimas.

Filed Sep 28, 2026 · Engine · IL

The contact owns a 2017 Kia Optima. The contact stated that after receiving an oil change, the contact became aware that the engine oil level was low. The vehicle was taken back to the service center, and the engine oil was topped off with an additional quart of engine oil. The contact was advised to return for an oil consumption test. There was no oil leak found and the contact was informed that there was an internal oil leak.

Filed Aug 7, 2026 · Engine · GA

I am requesting urgent assistance regarding my 2017 Kia Optima EX, which is experiencing a serious oil consumption/burning issue. The vehicle is burning oil into the engine, causing the oil level to continually decrease and creating a significant concern for engine failure, overheating, or a potential vehicle fire. I am extremely concerned about my safety and the safety of others because I depend on this vehicle every day. This is also my only vehicle, and I am still making payments on the financing. I do not have the financial ability to simply purchase another vehicle or take on a new car payment. I am asking Kia to please take this matter seriously and investigate the vehicle as soon as possible. I am requesting that Kia review whether there is a known engine issue, applicable warranty or assistance, recall/campaign coverage, or any other program that could help with the necessary repairs or engine replacement. I cannot afford to lose my only means of transportation because of an engine problem that is beyond my ability to financially resolve. I am asking Kia to work with me toward a safe and reasonable solution as urgently as possible. Thank you [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 16, 2026 · Engine · GA

The vehicle is consuming excessive amounts of oil. The dipstick was completely dry before 5000 miles were up. I had to add some oil to the engine to avoid engine failure. I have reported this to Jim Ellis dealership in Kennesaw GA but I was told to drive the vehicle until it knocks or the knock sensor goes.

Filed Jan 4, 2026 · Engine · ND

Kia Engine Settlement-Kia America and Grand Forks KIA dealership is refusing a mandatory diagnostic test for excessive oil consumption under the Kia Theta II Engine Class Settlement, despite the vehicle having the required KSDS software update installed. The vehicle is consuming 1 quart of oil every 1000 miles, requiring constant topping off to prevent engine seizure. Vehicle was brought to Kia Grand Forks on 7/21/25 was told that the valve gasket needed to be changed. Engine light illuminated 10/2025 and car was unable to make it back to dealership from 58369. Vehicle was brought to local mechanic where I was told that the has failed and that the spark plugs had oil on them. Mechanic changed the spark plugs to make it to Grand Forks Kia on 10/14/25 I was told that the Turbo needed to be replaced for $3300 before they can do an oil consumption test. There were no issues with the turbo before it was driven to Grand Forks on 10/14/25. Kia America refuses to cover the engine warranty which will lead to "sudden engine stall, loss of power, or vehicle fire," which are primary safety concerns monitored by the federal safety agency.

Filed Nov 16, 2025 · Engine, Fuel system · CA

I own a 2017 Kia Optima with a major internal engine defect. Starting shortly after purchase, the car lost power and consumed fuel unusually quickly. Over time, the engine began burning excessive oil and now produces a loud knocking sound (bearing knock), indicating internal bearing failure. These symptoms are consistent with known Kia engine defects (bearing wear / piston ring failure). The defect is a serious safety concern: because of weak bearings and high oil consumption, the engine could stall, seize, or catch fire. The dealership has refused to repair or replace the engine. I am reporting this as a safety defect and request the federal safety agency investigation.

Filed Oct 28, 2025 · Engine · 100,400 miles · CA

The contact owns a 2017 Kia Optima. The contact stated that upon routine maintenance with a local independent mechanic, it was discovered that the vehicle had low engine oil. No warning light was illuminated. The vehicle was taken to a local dealer, where it was determined that an oil consumption test was needed to determine any failure. The vehicle was not repaired. The check engine warning light was illuminated. The contact stated that engine oil was added almost every 2 weeks. The message to "Contact the Dealer" was displayed. The vehicle was towed to Team Kia of El Cajon (541 N Johnson Ave, El Cajon, CA 92020), where it was determined that there was engine oil leaking onto the catalytic converter. The contact related the failure to a Kia recall related to a connecting rod bearing failure. The manufacturer was made aware of the failure. The failure mileage was approximately 100,400.

Filed Sep 3, 2025 · Engine · DC

for the past year, I have been constantly replacing the spark plugs and ignition coil in my 2017 Kia optima. Recently I have had the valve cover gasket replaced. It is a constant oil consumption issue. I have received the P1326 diagnostic code. My dealership told me that the engine cannot be replaced unless it’s knocking. This is my only mode of transportation, and I would hate for me to be stranded because I’m waiting for the engine to knock for my engine to be replaced.

Filed Aug 21, 2025 · Engine · GA

Car began hesitating and stalling, particularly from a stop. Engine light came on. Took the car to the KIA dealership for diagnosis. Was told by svc coordinator that the diagnosis indicated a bad knock sensor. The technician replaced the knock sensor, then test drove the car. It failed immediately. I was told that it would likely need engine replacement. After a few days, svc coordinator called and said that KIA recommended replacing the knock sensor (again) and perform a tuneup. They declined to replace the engine. The car runs in "limp home mode" (Kia's terminology), hesitates and stalls so as to make it very unsafe to operate. The engine on this car was replaced about two years ago for excessive oil consumption. There cannot be more than 30k miles on the new engine. KIA stated that there is a lifetime warranty on the replaced engines, but are apparently not going to honor the warranty. Car is serviced regularly and is in otherwise excellent condition.

Filed Aug 19, 2025 · Engine · FL

My car is burning oil and oil is covering my spark plugs. Was mentioned about decarbonizing

Filed Jul 30, 2025 · Engine, Fuel system · CA

While driving my 2017 Kia Optima (Theta II engine) at approximately 115,900 miles, I suddenly experienced engine failure. The vehicle began to stall and produced a burning smell shortly before the engine seized completely. I had the car towed to a Kia dealership, which confirmed an internal engine failure and noted that there were no signs of external oil leaks or neglect. The failure occurred only 4,500 miles after my last oil change, which was documented and professionally completed. The Kia technician mentioned verbally that this was due to excessive oil consumption and burning — an issue I later found to be widely reported in other Kia vehicles using this engine type. The estimated repair cost is over $14,000, which is more than the value of the vehicle. Despite my warranty being expired, this type of failure appears consistent with known manufacturing defects. I am reporting this for public safety and accountability. The vehicle failed without warning and could have caused a dangerous situation on the road.

Filed Jul 30, 2025 · Engine, Transmission · GA

Excessive oil consumption started at 61,000 miles, causing engine misfires and dangerous power loss on the road. Engine codes 1326 and P0304 were frequent. Despite numerous services, including sensor replacements, spark plugs and oil top-offs, the problem worsened. At 97,769 miles, the dealer said a full engine replacement is needed along with other pertinent repairs related to the engine are needed. The situation was life-threatening each time as they occurred while driving and I now no working vehicle after my husband's recent death. Kia dealerships acknowledged the defect but refused to replace the engine and advised that Kia Corporate was refusing, although no claim information was ever provided that they indeed contacted the corporate office. I am seeking the federal safety agency support in holding Kia accountable.