2015 Kia Optima · symptom sheet
Burns oil or oil level rises
- 37owner reports
- 74,000median miles
- 1involved a crash
Newest report Aug 20, 2026 · checked Oct 2, 2026
659 of the 1,006 complaints on this car are about the engine. 37 of those describe oil consumption.
Tick what matches of 37 reports
Oil consumption on other Optima years
Report counts are for each model year on its own, so a newer car has had less time to collect them. Model years with too few reports of it for a sheet: 2014.
What this problem usually is
Two different complaints land here. The more common one is an engine that uses oil: owners add a quart between changes, get a low-oil warning, or are told by the dealer that the rate is normal. The other is the opposite, where the oil level climbs and the oil smells of gasoline. Both deserve a proper test, and both are easier to argue with records in hand.
What got replaced
Owners who name the part that was replaced mention the engine (8 reports) and the piston rings (5 reports).
Recalls and investigations
One recall on the engine covers the 2015 model year. A recall on the same system isn't always the same failure, so read the defect text.
The high pressure fuel pipe that connects to the fuel pump outlet may have been damaged, misaligned or improperly torqued during the engine replacement procedure, possibly causing a fuel leak.
All 4 recalls on the 2015 Kia Optima, with the owner complaints on each recalled system
NHTSA investigations into the engine on the Optima
Loss of motive power. Closed dec 12, 2023.
Engine fires. Closed feb 5, 2024, led to recall 23V-877.
Scope and timeliness. Closed dec 22, 2021, led to recall 17V-224.
When it happens
The middle half of failures fell between 62,800 and 108,516 miles, from the 25 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 4 service bulletins or notices for the 2015 Kia Optima that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES This bulletin provides information on diagnosing and/or repairing some 2011-2024MY vehicles (refer to the table on pages 9 and 10 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES This bulletin provides information on diagnosing and/or repairing some 2011-2021MY vehicles (refer to the tables on pages 8-9 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES This bulletin provides information on diagnosing and/or repairing some 2011-2019MY vehicles (refer to table below for applicable model and engine), which may exhibit a symptom of excessive oil consumption.
EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA ENGINES This bulletin provides information on diagnosing and/or repairing some 2011-2019MY vehicles (refer to table below for applicable model and engine), which may exhibit a symptom of excessive oil consumption.
What owners wrote
“Oil Changed 02/18/23, No leaks reported. Highway driving, now the vehicle is burning oil and has leaks, engine not running properly at highway speeds.”
Filed Mar 6, 2023
“Engine oil consumption is extremely high with no leaks and caused damage to the engine. Causing car to quit and lose power. I have been doing my oil changes correctly.”
Filed Jun 29, 2021
Should you keep driving it?
This page can't tell you that. 1 of 37 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Paid for this repair before a recall covered it? How recall reimbursement works
Other problems on this car
- Engine failure, knocking or rod bearing 319 reports
- Engine stalls or loses power while driving 256 reports
- Check engine light or misfire 108 reports
- Brakes grind, pulse or wear early 89 reports
- Vehicle fire 70 reports
- Paint peels or body rusts 56 reports
- Engine rattles or ticks 49 reports
- Battery dies or the car will not start 30 reports
- Airbag warning light or recall 26 reports