NHTSA Complaint #11574111 — 2016 KIA OPTIMA

My 2016 Optima started burning a quart of oil at 60000 miles I am now burning over 1 quart of oil every 1000 miles. I took it to the dealership where I bought it from and was they would change my oil to do an oil consumption test and I was to drive it no more than 1000 miles. I brought up my warranty for engine replacement and was told yes I do have warranty. I drove it just under 1000 miles took it back, was told I was burning oil but I would need to do an engine flush 1st, for the cost of $600. I told the young women that was not what she said. I have been dealing with this issue since 2021. I don’t know if you can help me or not , if not can you give me any advice Thank you (I am not sure of the exact dates that it started)