NHTSA Complaint #11546135 — 2016 HYUNDAI TUCSON

Prior to these oil changes and tires was completed and March 2023 engine light on and whining noise took it to Firestone twice they ran complete diagnosis twice and mechanic found no leak around the engine or leak in bottom and they recommended that I take it Hyundai dealership which I did that same month again Hyundai Service ran diagnosis and recommended replacing some air valve to fix the problem but the part needed to be ordered; again it took over six weeks to get appointment for service at this Hyundai Service dealership do said repair and I ask if I can still drive the car with engine light on they said it was o.k as long as engine light not was blinking. The next day engine light came on again and it took over six weeks to get appointment with Hyundai Service dealership in my area and the car sat in the driveway for over month. Now September 2023 same Hyundai Service ran engine diagnosis now need gasket and valve and they said engine failure because no oil in the engine and would cost $11K to replace. So please tell me in over month that car sat in driveway with no visible leaks in engine area and no leaks in the driveway, so where did the oil go and only answer I can deduce engine is defective.