10.0

really awful
Crashes / Fires:
1 / 8
Injuries / Deaths:
0 / 0
Average Mileage:
18,257 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2018 Kia Optima engine problems

engine problem

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2018 Kia Optima Owner Comments (Page 2 of 5)

« Read the previous 20 complaints

problem #63

Apr 162023

Optima

  • miles

A D V E R T I S E M E N T S

Unknown

- Riverside, CA, USA

problem #62

Jul 012023

Optima

  • miles
vehicle stated was consuming a large amount of oil by burning it. this was able to be determined by the lack of oil or residue anywhere on the engine or engine compartment. It was then taken to the dealership were it was determined an engine oil consumption test needed to be done. the test was done and was determined that it needed an upper engine combustion cleaning to correct issue. The vehicle was then scheduled to have this procedure done. upon completion of this procedure the vehicle continued to burn oil as it could be seen out of the tailpipe upon acceleration. a second oil consumption test was performed and was found to be within dealer specs of acceptable oil consumption at 1qt per 1000 miles. When the next oil change was done by an independent garage, it was noted that the vehicle was now leaking oil from what appeared to be the oil drain plug. The dealer was then informed with pictures of the oil leak. The vehicle began leaking more and more oil now at a rate of 1/2 qt a day as of writing this the independent garage inspected again and found that there was a crack in the oil pan just to the side of the oil drain plug. After doing some research it appears to be a very common problem. The vehicle in question is supposed to be taken into dealership to have the issue checked out on the 4th of October 2023. todays date is 9/26/2023.

- New Castle, IN, USA

problem #61

Sep 152023

Optima

  • miles
Car will NOT go pat 60mph and i haven-??t had this car just over 6 months. And the camshaft sensors are gone out. Smoke comes out the pipe when mash on gas-??. It is really a bad vehicle. And Southeast auto refuses to fix it. I really honestly think the motor is bad in it. Because I been having issues with it since I had

- Terry , MS, USA

problem #60

Jun 012023

Optima

  • miles

A D V E R T I S E M E N T S

Excessive oil consumption 1-1.5 months approx. 1,000 miles into new oils change. It is available for inspection. Safety was put at risk due to not knowing there was no oil in my vehicle while constantly driving it as it did not display the oil warning sign on the dash board. The oil change dealership has confirmed an oil consumption issue two separate times. I am familiar with multiple people having this same issue with Kia and hyuandia vehicles. The dealership is requiring multiple steps to be paid out of pocket prior to using the full warranty i purchased to cover the issue even though they know what the issue is and how to fix it.

- Durham, NC, USA

problem #59

Aug 192023

Optima

  • miles
purchased my car in june of 2019. Ive scheduled regular oil changes and maintenance until june of 2020 where the engine light began to flicker and the car would shake. I took to Koons Kia owings mills md and it was repaired. Next year same thing. Oil compression issues all year round where i have to keep putting oil in. Now my car starts and shakes violently. the kia service modurator on the car indicated there were an engine issue. I cannot keep dishing money into this car with so many recalls (current fuel pump recall and anti theft issue) is also included. Please help

- Pikesville, MD, USA

problem #58

Aug 032023

Optima

  • miles
I'm reporting these issue pertaining to the engine within the first 3 weeks AFTER the engine replacement recall was serviced and completed. The vehicle was exhibiting the same defects and major health and safety hazards as before the new engine. Intermittent engine failure, even worse, while i was trying entering the hwy at speeds of 45-50 miles it jerked very violently and loss total power while vehicles were behind me nearly rear ended. Prior to this I reached out multiple times to have it serviced at again. The original service department didn't respond, so I called other service departments and was told it needed to be serviced by the original dealership/service department that replaced the engine. I had the vehicle in normal working conditions a few days before it began exhibiting the same problems as before the engine replacement. It was in operable condition but still stalling and refusing to crank unless primed, until it ultimately just would not crank at all and is back in the same condition it was before the new engine but it is not locked up currently. The time frame and Milage between first experiencing the issues to now, March 2023-64745 Started shuddering, loss of power while driving, but would crank right back up without issues. Happened a few times, charged up battery thinking is was am electrical issue. April 2023 More frequently the issues occurred, still same severity levels. May 2023 Began happening every time at an idle, whether I was at a fast food in drive through placing an order, or to wash the car. Every time at an idle this would happen, and would take a few times of trying to start the vehicle and after about 5 seconds of cranking it would catch and work. I began placing the vehicle in neutral while at idle and it would assist In the stalling out sometimes. After a few days of this it refused to crank due to the engine locking up. Milage at this time was 68048. Aug 2023-New engine, drove about 2k miles-70207 current

- Humble, TX, USA

problem #57

Jul 242023

Optima

  • miles

A D V E R T I S E M E N T S

My vehicle is under a engine / oil consumption recall, I have contacted kia multiple time in regards to this issue as the vehicles are having engine fires due to this. I was advised by kia that my vehicle is under recall and has lifetime warranty but they will not fix or swap the motor until it goes out. This is a huge safety risk I am literally scared to drive my vehicle due to not knowing if the engine is going to go out at anytime or start on fire in the middle of the expressway.

- San Benito, TX, USA

problem #56

Jul 192023

Optima

  • miles
Vehicle is burning excessive amounts of oil rapidly. Date of Purchase: 04/13/2023 - mileage : 94,000-96,000 Oil light and engine light began flashing about 1-2 weeks after purchase, then went off after first oil change. noticed burning smell on occasion. First oil change 05/23/2023 - mileage: 98,045 Mechanic reported no oil in vehicle. Traveled out of town, checked oil. no oil in vehicle upon arrival. Second oil change: 06/19/2023 - mileage ~99,641 Mechanic reported no oil leak. Checked oil: 07/18/2023 - no oil in vehicle, mileage: 100,790 Having to schedule an oil change before future date and mileage listed below. Next date of oil change: 09/17/2023 - future mileage: 102,641

- Little Elm, TX, USA

problem #55

Feb 172023

Optima

  • miles
Engine failure just like all the other optima-??s.

- Decatur, GA, USA

problem #54

Jun 192023

Optima

  • miles
My engine started making a horrible noise and jumpimg. The oil was just changed and is fine. Having to replace engine and only had car 2 months

- Smithville, GA, USA

problem #53

Jun 152023

Optima

  • miles

A D V E R T I S E M E N T S

Knock sensor detection system. Driving and all the sudden felt like it hard down shifted-?? car behind me almost hit me. Engine light started flashing so I pulled into autozone and plugged it in and got the knock sensor code. It-??s had oil consumptions issues for a while. It-??s so dangerous to drive with limited power and speed

- Clover , SC, USA

problem #52

May 242023

Optima

  • miles
I purchased this vehicle used in April 2023 with 3,000 to go prior to another oil change. I returned home from a trip and the oil light would come on only while turning or braking. When checking the oil there was no oil in the motor. The reservoir was filled and two weeks in the engine is low on oil again. There are no leaks. The car jerks at lights as if it wants to stall out. I feel unsafe driving this car.

- Roscoe, IL, USA

problem #51

May 162023

Optima

  • 68,000 miles
High injector fuel pump top engine mount went out at 68000 miles. It caused the vehicle to stall and lose power and basically cut the car off while driving.

- Humble, TX, USA

problem #50

May 262023

Optima

  • miles
-Knock Sensor Detection System - ECU Logic Improvement - I Was driving with my infant son in the backseat. I was going 70 mph when my car started rapidly losing speed. This happened again with just myself after receiving the car from mechanic. There was heavy traffic and I had to swerve to avoid being hit by an 18-wheeler. - I can see on the website where I received the car from, there is a recall for my exact make and model with the same code but they say there is no recall for my specific car. - The check engine light started flashing and Kia Systems starts talking.

- Lithia Springs , GA, USA

problem #49

Feb 062023

Optima

  • 106,983 miles
Car smoking white, and driving slow after I hit a pothole when it was raining hard.

- Arcadia , CA, USA

problem #48

Apr 262023

Optima

  • 70,000 miles
The contact owns a 2018 Kia Optima. The contact stated that the vehicle was sputtering while being started. The contact stated that the vehicle also sputtered while driving at various speeds, and while reversing. The check engine warning light was illuminated. The vehicle was taken to the dealer and the contact was informed that oil was getting onto the spark plugs and ignition coils. The spark plugs and ignition coils were replaced; however, the failure persisted. The manufacturer was not made aware of the failure. The approximate failure mileage was 70,000.

- Pittsburgh, PA, USA

problem #47

Nov 092022

Optima

  • 77,000 miles
The contact owns a 2018 Kia Optima. The contact stated while starting the vehicle, the oil warning light illuminated. The contact checked the dip stick and there was no oil on the dip stick. The vehicle was taken to the dealer and an oil change was performed; however, the failure reoccurred. The vehicle was taken back to the dealer and the engine was cleaned but the failure reoccurred. The manufacturer was contacted but provided no assistance. The failure mileage was 77,000.

- Charlotte, NC, USA

problem #46

Jun 082021

Optima

  • miles
consistently getting oil changes. if the car doesn't rcvd an oil change before 3000 miles the check engine light comes on and then the light removes after oil change. in between the time period of getting oil changes it may run junky or you hear the catalytic converter trying to push air thru and it rattles.

- Bear , DE, USA

problem #45

Apr 122023

Optima

  • miles
My car engine burns oil EXCESSIVELY. After an oil change, 2 weeks later i had to put more oil in. The dealership is no help even with a warranty. The car burning oil is also causing other mechanical problems that are a hefty price that are only a temp fix. I have to put oil in every single week. 2-3 quarts a week. Due to the oil being burnt off, it has affected my spark plugs and has caused a misfire in the same exact cylinder for when it misfired for this same problem, a year prior. I took it to a kia dealership last year and they performed a combustion chamber cleaning ($650+) and it only worked for 3 months before my car was back to performing poorly due to power loss from misfiring again. This car has put me in a VERY TOUGH financial situation and the dealership and corporate are absolutely no help. a year apart, this car has misfired on the same cylinder twice. the dealership just tells me to do a combustion cleaning but due to it being very pricy and with how much oil i have to buy, it-??s not an option for me due to my financial situation. right now i-??m just hoping something will be done for the millions of people that are effected by this.

- Cape Girardeau, MO, USA

problem #44

Mar 242023

Optima

  • 122,760 miles
The contact owns a?2018 Kia Optima. The contact stated that after an oil change was performed on the vehicle, the oil pressure warning light illuminated. Upon inspection, the contact noticed there was no oil in the engine. The vehicle was taken to an independent mechanic, who added oil to the engine. The vehicle was not diagnosed nor repaired. The dealer was not notified of the failure. The manufacturer was made aware of the failure. The failure mileage was approximately?122,760.

- Columbus, OH, USA

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