NHTSA Complaint #11682419 — 2020 KIA TELLURIDE

Vehicle burns oil, current mileage at 169k. User manual indicates 7500-10000 miles between changes, I am original owner. Dealership service set for 5k intervals since purchase and done on time. At 99k noticed noises from engine, light rattling but couldn't replicate and couldn't pinpoint at dealership service. At 112k noticed burning oil and rattling noises when accelerating from stop. Changed to 3k oil change intervals, began using premium fuel. 1quart of oil at 0-1000 miles from oil change (had a consumption test at dealership and confirmed "normal" at 112k), sub sequential mileage burns more than 1quart between 1k intervals, can easily burn through 4-5quarts between 3k oil changes. Oil smells slightly like gasoline closer to oil change time. Outside mechanic confirmed rattling as detonation. Concerns of oil not "burning" but mixing with fuel either through oil vapors getting through PCV valve and diluting fuel octane causing rattling. Knock sensor suppresses from causing engine damage, but still happens. Fuel may be getting into the oil, not sure how, but wouldn't explain detonation. No codes, no other issues. Only check engine light since rattling noticed at 99k was failing O2 bank 2 sensor which was replaced by licensed mechanic with OEM parts. The amount of additional oil maintenance and changes were not disclosed on expected maintenance costs sheet posted on vehicles, nor is it communicated in the users manual. Personal opinion is the additional maintenance between changes is unreasonable, and oil isn't "burning" but leaking into the combustion chamber.