Oil started leaking from the car and checking underneath it looked as though it was leaking from the plug so i replaced the plug, which did not fix the issue, and accidentally forgot to put the gasket back on. took it to the local shop was given a gasket and an oil change. the car started leaking oil worse than before so i took the car back. The oil pan had a little over an inch long crack on the corner/edge where the oil pan plug is. Mechanic told me he-??d never seen or heard of a steel oil pan cracking before. $400 for a new oil pan made from below par steel.

- Springfield , MO, USA

My 2016 Kia Optima has been consuming oil every 1.5months. I have multiple times had to replace my oil because my oil light kept coming on. I-??ve checked it every single time and it is barely anything there. I have my breaks mess up and not work as properly with my safety and others being comprised. I have brought this up to my Kia dealership but they have just brushed it off and charged me for an oil change. I have seen and heard many cases like mine and it has happened worse to them to the point where the car stops in the middle of the highway. My car has been checked by others and they have all noticed the same thing - the oil levels extremely low only after 1 and a half months or way prior to when my next oil change should be made. Having this happen is expensive and life threatening when the brakes don-??t work as they should or when my could possibly bust. I have received no help and would like to make this known.

- Chicago, IL, USA

This 2.4ltr engine burns 1 quart per 1000 miles! 53769 miles, Kia claims not under warranty and wants over 600 dollars for an engine flush! KIA OF PORT CHARLOTTE FL. They filled my oil too much! It is at least a half a quart above full! They also filled the Kia with 5-30, I do understand that from book and temp. Ranges. Found PCV valve partially defective and replaced that... Can you help me understand why I have no warranty under 54,000 miles and why engine is not covered under 100,000 miles" Also, is this defect acceptable to the NTSB" It has caused multiple accidents due too engine failure and seizing Sincerely, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Port Charlotte, FL, USA

Knock sensors

- Wadmalaw Island , SC, USA

Crack in dash along outline of airbag. Burns oil so it has to be refilled monthly Now mechanic says compression and combustion are problems Can-??t get into Kia until February when warranty will probably be expired

- Savannah, GA, USA

The 2016 Optima SX Ltd is consuming oil, but no leak can be found by the mechanics. It is available for inspection upon request. Had the motor seized, I would have been stranded on the side of the road. I have all the CarFax Service records. It is serviced IAW Mfg recommendations. The oil light flickers and turns off at starting. A service engine in 30 days light came on. Took it to change the oil and there was NO oil in the vehicle. The oil and filter were changed, the engine cleaned and no leak could be detected. One week later the engine oil light flickered on and the oil was checked. It had consumed 1.5 quarts of oil in one week. There are zero oil stains in my driveway where the vehicle is parked every single day. This problem has been reported on multiple complaints NHTSA ID#s 11539081, 11538898, 11538679, 11538029...since August 1. Kia should issue a recall or investigate why the vehicles are consuming so much oil that leads to engine damage/failure with occupants stranded on the side of the road. Why is the oil light just flickering on and then off and not staying on if the oil is low? Please help.

- Fort Worth, TX, USA

The contact's son owns a 2016 Kia Optima. The contact stated while his son was driving 35 MPH, the vehicle stalled. Several unknown warning lights illuminated. The contact stated that his son was able to pull into the driveway. The vehicle failed to restart. The vehicle was towed to an unknown dealer, where the failure could not be duplicated; however, the dealer informed the contact that the failure could be related to the engine rod bearing. The vehicle was not diagnosed nor repaired. The manufacturer was notified of the failure and referred the contact to the dealer. The failure mileage was approximately 170,000.

- Prairie Du Sac, WI, USA

My daughter was driving on the interstate and her car lost power while driving. This is a major safety issue. A car losing power in the middle of 80 or higher mph traffic could result in fatalities.

- Knoxville , TN, USA

The contact owns a 2016 Kia Optima. The contact stated that the vehicle was consuming an excessive amount of engine oil. The engine consumed 5 quarts of oil for every 5,000 to 7,000 miles driven. Additionally, the contact stated while driving at an undisclosed speed, the accelerator pedal was depressed, and the vehicle accelerated quickly. The vehicle was taken to the dealer for an oil change, and the dealer informed the contact that the vehicle was consuming an excessive amount of oil and that there were no leaks found. The manufacturer was not made aware of the failure. The failure mileage was unknown.

- Toano, VA, USA

There's an oil consumption problem... I'm burning through a quart of oil about every 300 miles. there are no leaks. Just burning the oil way too fast... There's been numerous people with this problem and no one has issued a recall... The car started doing this at around 60,000 miles. there's still plenty of life on this engine. It should in no way be burning this much oil... We need help. I was told it's part of an investigation already... We need this to be labeled a recall... This is not normal and thousands of people are having this problem with this model 2016 Kia Optima

- Mesa, AZ, USA

5/9/23 appointment for 4 recalls -completed 2 and ask if we could bring back next day to finish and we said no because granddaughter in school so service manager said important to get it back in and finish and sent granddaughter home with car 5 days later while driving car caught on fire and lost brakes and transmission and swerved into vacant parking lot smoke and flames coming into car and girls had to jump while car was still moving both girls checked on sight for smoke inhalation. 15 year old had to go to emergency room for road rash and nerve issues. we have documents,911 tapes, videos, text, ,,witnesses, pictures. very negligent on service dept. for sending car out without completing issues. we came ready to leave it but they sent it out.

- Frenchburg, KY, USA

2016 KIA Optima is burning excessive oil. Current mileage ~85K, under power train warranty. The KSDS S/W upgrade has been done. Took car to KIA dealership. Tested twice and confirmed 1/2 quart and 3/4 qt burned in 1000 miles. Limit for service was >1 qt in 1000 miles, so no action taken. Question #1. How/where was this limit established" Clearly hear a knocking sound and blue smoke out the tailpipe upon starting. A copy of video showing the tailpipe smoking was submitted to KIA. The internet references a class-action suit for this problem and NUMEROUS complaints. Question #2: Why has NO recall been initiated for this problem across numerous models and several years, anyone with a 4-cyl GDI engine? Maintenance interval is 7500 miles for each synthetic oil change. This means I will put in more than 5.5 quarts of oil between oil changes??? And this is NOT a problem??? Question #3: Why is this NOT an EPA pollution issue" Finally, the KIA dealership told me to come back in, if the problem exceeds the >1 qt per 1000 mile limit. I asked and there is NO extension of the 100K power train warranty, (in 15K miles) so after 100K, any engine repair/replacement would be at my cost. At 85K, my resale value has plummented and 2-3 nonKIA dealerships that I have spoken to about a trade-in are NOT interested in this car as a trade-in. Question #4: HOW does this NOT qualify as a RECALL? -1) Class action lawsuit on record? -2) Known problem over several years/models with the 4-cyl engine? -3) Engine seizing and shutting down due to oil loss seems like a safety issue to me? Final QUESTION: How do I get involved (after the fact) with the Class action lawsuit? I seem like I'm in suspended animation, e.g. won't fix it, can't trade it, WHAT A MESS!

- Yalaha, FL, USA

Car has been consuming too much oil and burning spark plugs all the time since car was at 80k miles. Car was covered under a bumper to bumper 100k mile warranty. Now at 136k, dealership is now doing oil consumption test, but even if we fail this test, new engine will not be installed. Dealership is saying they -??got in trouble-?? for replacing too many engines and now an inspector has to come out to inspect the engine, which is only once every 2 weeks. Kia will not pay for rental car and car has to stay on lot until inspected, and will only pay for rental car after inspector looks at car. We were also told that unless the car throws a knock sensor code, throws a rod, or locks up, engine will not be replaced and we will have to pay for all repairs. We are the sole owners of the car, and all updates/recalls have been done at dealership. Dealership even told us to -??run the car with no oil, let the engine lock up, and then replace the oil before bringing it to dealership-?? and that doing this will ensure a replacement engine. We also have the lifetime warranty on the engine, but Kia will not honor it unless we throw a knock code, throw a piston/rod, or engine locks up. This is a HUGE safety hazard not only for us driving, but for others on the road as well. We add no less than 2 quarts of oil per week and change at least one spark plug a month.

- Lancaster, KY, USA

Excessive oil consumption, 1.5 quarts or more per ever 1,000 miles.

- Bedford, IN, USA

The contact owns a 2016 Kia Optima. The contact stated while driving approximately 55 MPH, the check engine warning light started flashing. The contact stated that smoke was coming from underneath the hood and an abnormal knocking sound was coming from the engine compartment. The contact stated that he pulled over, stopped, and had the vehicle towed to the dealer. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the engine needed to be replaced. The vehicle had not been repaired. The contact had previously had a software upgrade for the knock sensor performed; however, the dealer stated that the engine had already suffered engine block damage and the vehicle did not qualify for an engine replacement. The manufacturer had been informed of the failure. The failure mileage was 138,769.

- El Dorado, KS, USA

2016 Kia Optima engine failed on freeway, ECU triggered limp mode had to get towed into dealer. Now dealer verifies engine failure issues but insists on having us drive it 1000 miles then come in to have engine oil consumption measured and do the same again for a total of 3000 miles before they honor engine replacement. Or engine completely fails within the 3000 miles. Car already shows heavy oil consumption, very dirty oil before mileage due to be changed, loss of MPG at least 5 miles per gallon after ECU upgraded. Car is sluggish and hesitates on acceleration, engine knocking noise. Bearing clearance test passes at this time. I feel I am driving a ticking time bomb getting ready to leave me somewhere stranded.

- Lakeside, CA, USA

The car was diagnosed with a knock sensor problem in the engine. At that time I was told it was a recall regarding that matter. 2 months ago I took it to Kia Mall of Georgia in Buford, GA. At that time they said they fixed the sensor within 3 hours. The car wasn-??t accelerating past 50 mph, the engine light was on and in struggled going up hills. After I got the car back, the next 3 days the engine light came back on and the car starting doing the exact same thing again! I called and told them and they told me to bring it back to them. So I took it back to them. After my car being there for 2 1/2 almost 3 weeks they told me they would have to replace the engine with a new one. At this time no one offered to get me some type of loaner car. On the third week they claim they were still working on it but the mechanic didn-??t show up for 2 days. He left on Friday June 30th, 2023 and didn-??t come back until Monday July 3rd! When he left on Friday I was told by Andrew Aycock that the car would be ready that Saturday, July 1st 2023. No one called so I ended up calling them Saturday and I was told the mechanic didn-??t come to work so the car would be finished on Monday July 3rd. Of course that was a lie as well. I asked about a loaner they said they would get me one, that they had to call Hertz rental. They called me back and told me they couldn-??t provide me with a loaner. So I still NEVER got a loaner and they had my car right at a month!! They called me Friday July 7th and told me the car was ready. I picked the car up on Friday. They said they put a new engine in it. Today is July 18th and it-??s been a little over a week and the engine light came back on today!!. The same problem again. I have been so inconvenienced throughout this entire ordeal. It-??s very hard to get in touch with anybody up there regarding my vehicle. Now I have to take it back up there, but something needs to be done asap! If it-??s not the engine maybe it-??s the car itself also I need a loaner Immediately!

- Butler, GA, USA

In April, 2022, while driving on a major highway enroute to work, my 2016 Kia Optima started knocking and completely shutdown in the middle of high-speed traffic. I had the vehicle towed and was told that the recall for the engine knock sensor replacement hadn't ever been done which resulted in the engine to shutdown.

- Bahama, NC, USA

I have had zero, I mean zero issues with my Optima before today. I-??ve maintained the vehicle since I purchased new in 2016 from Auffenberg Kia in Illinois. I had made it about halfway home when the vehicle started making a shuttering noise and began hard to drive. The first part of my drive was highway, no issues. The second part of my drive was country roads so a little slower speed when this began. The hard drive feeling went away briefly but was then followed by a flashing check engine light, still feeling okay to drive & maintaining a consistent speed. After I had slowed to go around corners is when it began again. I accelerated and the car accelerated as well but the rpms weren-??t going over a thousand. Kept driving fine with no shuttering. Once I stopped at the stop sign and accelerated I couldn-??t get over 30mph without the front end rattling and a faint squealing sound. I putted home and there it sits. A friend of mine is a mechanic and came with his diagnostic reader. Long story short, engine failure. I-??m frustrated all over again because this seems to be an ongoing issue with the Optima-??s with no resolution. I just hit 111k miles, which is not high miles for this to happen considering the vehicle is in good condition. Next is to get towed to the junk yard because it-??s not worth putting a new engine in it & hopefully for a resolution from Kia.

- Valmeyer, IL, USA

Unknown. My oil light started to turn on while I was still 1200 miles before my next oil change. I check the level of my oil and it was completely empty.

- Fontana, CA, USA