2015 Hyundai Tucson: excessive oil consumption

Filed Aug 8, 2026 · Engine · NE

We have a 2015 Hyundai Tucson that we bought brand new. It has 80k miles on it. The car started using oil about three years ago. The dealer recommended replacement of the catalytic converter, which we did. The car continued to use oil, and the dealership had us replace the catalytic converter two more times, so three times total. Now the problem is occurring again and they are recommending replacement of the catalytic converter for a FOURTH time. We have filed a claim with the manufacturer and have been going in circles with the dealership for months. It is our position that the repeated catalytic converter failure is caused by an underlying motor issue, which should be covered by the manufacturers warranty, but the dealer treated the symptoms instead and waited for the warranty expiration. This car is owned by my father, an [XXX] disabled veteran. He bought this car thinking it would be a safe and reliable vehicle for him to drive into his retirement years. Instead, Hyundai is repeatedly making him pay to replace the same part when it is clearly not resolving the oil consumption issue. He is being taken advantage of. Hyundai should honor their warranty. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 24, 2025 · Engine · SC

I started having oil issues 3 years after purchasing my hyundai Tuscan 2015. I took my vehicle to hyundai several time all of which I was told by service guy and I quote “Hey its Hyundai, just following up so right now we have a consumption issue. It is currently 2.5 quarts low. The tech recommends re doing the oil change and returning in 1000miles and recheck. When you return and we see that the oil level is more than a quote low then we would have you reduce the service interval from 5000miles to 3000miles, let me know if you have any questions. I had many questions and also wanted to know why it was my responsibility to do all these things if they know the engine is faulty. Had another diagnostic and the code P1326 populated. That means indicates an issue with the Knock Sensor Detection System (KSDS), often pointing to actual engine knocking caused by worn connecting rod bearings, but also potentially to a faulty knock sensor, wiring problems, outdated ECM. The Theta II engines are documented to have clogged oil galleys, preventing proper lubrication and causing premature wear. They do everything the can NOT to fix the issue even with a lifetime warranty on that engine.

Filed May 31, 2025 · Engine · GA

engine is burning oil. have to replenish oil level once a month, started about a yr ago

Filed Aug 20, 2024 · Engine · CA

- My engine seized while driving North on [XXX] from San Diego to CA. After having it towed to a shop I was informed it was completely out of oil which caused the engine to seize and would need to be replaced. My last oil change had taken place within about 6k miles and should not have been out of oil. Additionally no oil light, engine light, or any light on the dashboard was on to notify me something was wrong. - I was on a major CA highway in the far left lane when the engine seized and would no longer accelerate. I was incredibly lucky to make it across 4 lanes and that there was an off-ramp right there so I could get off the highway. This could have caused a massive pile-up accident. - The first shop it was towed to confirmed no oil and engine seizure. Hyundai has only acknowledged I need a new engine but won't confirm it was due to lack of oil, likely because they know there are massive oil consumption problems with this Theta II engine. - Hyundai has now had my vehicle for 2 months and is denying warranty coverage as I cannot produce 2 out of 9 years of oil change records. I have provided the other 7, which include records of the last 4 years of consistent oil changes. - There were no warning lamps, messages, or other symptoms of the problem before failure. There was no way I could have known anything was wrong or that this was going to happen. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 15, 2024 · Engine · AZ

Vehicle code P1326 Flashing engine light Knocking noises while accelerating Indicates of low oil level When accelerating in doesn’t want to accelerate and it feels like it wants to stall out and shut off

Filed Jun 5, 2024 · Body, Engine · FL

The passenger door handle will not open from the outside door after using keyless entry or door unlock. This put people at risk if someone is trying to rescue the person from an accident or other critical injury where one needs help to escape from the vehicle. There are numerous reports of this manufacture and model where the front doors or back passenger doors will not open. Carguru has a page listing this issue as well [XXX] The issue just happened one day when I tried to open the door for someone. This needs to be investigated. I have been told by a local mechanic that it would cost anywhere from $400 to $800 in repairs. The second issue is that the engine burns oil faster than normal. I have a normal commute to work and before the 3,000 mark for an oil change, my oil light comes on in my vehicle. I check the oil only to see that it's very low. My mechanic has stated that Hyundai Tuscan and the Kia Sorento have this engine issue. The burning of the oil is faster and the catalyst converter has to be changed faster due to high amounts of carbon being burned. Please look into this matter INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 29, 2023 · Engine · WI

I have a 15 Hyundai Tucson that has been shutting off on me while driving on a highway going between 55 mph to 70 mph. Engine went into limp mode, CEL is on and flashing. Knocking noise heard from engine and consuming oil. Diagnosed with P1326 code. Brought to local Hyundai dealership. Even though road test stated normal operation, technician notes that vehicle DID stall, shut off, on return to the shop. No codes. Was told Hyundai would not pay for man hours to look into further. So allowed me to drive off their lot. Upon re-search I found, with NO help from local Hyundai or the dealership I purchased vehicle from, that my VIN number is associated with the E2 class action settlement that just went live May 2023, that my engine is indeed infected, like a cough before the cold, and has the potential of starting on fire/failure. Now I purchase this vehicle in 08/2023 with no disclosure of this very concerning problem. I am told by Hyundai USA that there is a paper trail that every affected VIN in the settlement has been notified, by law, to owners of affected VIN’s, and still not disclosed. I reached out to Hyundai USA at the national level, was given a case manager, who sent my case to the buyback/legal department. My case manager reached out and stated that my case has been denied due to age and mileage of vehicle (even though automatically extended to 15yr/150,000 miles) I asked what my next steps should be as my vehicle is still shutting off on me while driving and was told to have a different Hyundai dealership diagnose vehicle, but to not tell them all of the information of it already going to one Hyundai dealership. I was told if I hear a noise from the engine that I should pull off to the side of the road and call for a tow truck. I said so Hyundai USA feels good allowing this vehicle to be operated on highways knowing the symptoms I am experiencing. They obviously do not care for my safety let alone passenger safety, nor other motorist on roads.

Filed Jul 3, 2023 · Engine · 100,000 miles · MA

The contact owns a 2015 Hyundai Tucson. The contact stated that after reaching 100,000 miles, the vehicle started consuming an excessive amount of engine oil. Upon observing oil consumption, the contact stated that he had to add 1-quart of engine oil every 700 miles. The contact stated that previously the vehicle was receiving an oil change every 5,000 miles. The low oil warning light would illuminate on the instrument panel. The vehicle was taken to an independent mechanic however, the mechanic was unable to determine the cause of the failure. The mechanic suggested that oil be added every two weeks due to the excessive oil consumption. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 100,000.

Filed May 2, 2023 · Engine · IL

Oil burns it uses alot of oil like if it was leaking oil consumption

Filed Mar 15, 2023 · Engine · 155,000 miles · FL

The contact owns a 2015 Hyundai Tucson. The contact stated that 2-quarts of engine oil was added every other week. The contact stated the vehicle was consuming 8-quarts every month without evidence of an oil leak. The check engine warning light was illuminated. The vehicle had not been taken to the dealer. The vehicle had not been repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 155,000.

Filed Jan 11, 2022 · ID

Oil consumption. Why is my car using so much oil? I do regular oil changes and I’m always 1 -2 quarts low when I go in for my oil changes. Last oil change. I was told to come back in 1000 miles. I’m 300 miles shy of that and I checked it and I was already a quart low. With all the complaints that I’ve just read. You’d think you a recall be done. Or taking the cars off the market. What I’m a supposed to do in the meantime about this? Help!! Emmett Idaho

Filed Jul 23, 2021 · Engine · OH

Driving down the road and suddenly the check engine light came one and the engine started producing a knocking sound. I called several dealerships and had a couple of them run the VIN, which they said there are no recalls. However one dealer had mentioned that Hyundai vehicles, including Tucsons are starting to come in at astonishing rates with the same problem I have. I called Hyundai USA and they said there have been some known issues with engine failure describing the same problems mine has along with some known to have increased oil consumption, but they do not know why. They even said that sometimes the owners would not know of the increase in oil consumption and it could in turn cause engine fires. Any dealership I have contacted said due to the increase of vehicles brought in with the same problem, they are unable to even look at my vehicle for a month and to repair is possibly several months out.