NHTSA Complaint #11446685 — 2016 HYUNDAI SONATA

I purchased my '16 Sonata as a Certified Pre-Owned vehicle. It was 1 yr old, with roughly 36k mi on the odo. I bought it from Huntington Beach Hyundai, who showed me the Car Fax that it's CPO. They promised Hundai CPOs get what left on the 10 yr, 100k mi powertrain warranty. I've been doing oil changes per manufacturer recommendations since purchase. At roughly 40k to 60k on the odo, I noticed the car was burning a lot of engine oil. I brought my car to my local Hyundai service center, Tustin Hyundai, who told me 1 qt every 1k mi is normal. I thought it was a lot, but Tustin Hyundai told me there was nothing wrong with the car. Sometime after, I received mail about the Theta 2 engine recall to get the knock sensor install/update, and read about the risk of engine explosion/fire. I promptly got it done. Around this time, I read on Hyundai owner forums that excessive oil consumption is a precursor symptom to catastrophic engine failure. Sometime later, I noticed my car was burning a lot of oil, even more than before. I estimated at least 2 qts every 1k mi. I brought my car to Tustin Hyundai at roughly 75k mi on the odo. They started an oil consumption test, comprised of 3 oil level readings, each one every 1k mi. My car failed the first two. After the 2nd, my car stayed at Tustin Hyundai overnight to get a combustion chamber clean done. Tustin Hyundai told me doing so will solve the problem. Few months later, I noticed my engine was back to even more excessive oil consumption. I estimated at least 3~4 qts per 1k mi. I brought my car to Tustin Hyundai again, with roughly 80k mi on the odo. They said Hyundai corporate is rejecting all further service because my car isn't CPO, and that I ran out of powertrain warranty at 5 yr/60k mi. I called Huntington Beach Hyundai, who confirmed my car is CPO, and still has the 10/100 powertrain warranty. But Hyundai corporate, through 2~3 national case managers, told me I am out of powertrain warranty, and not covered.