Radiator problems of the 2012 Kia Motor Sorento

I was driving my 2012 kia Sorento on the highway driving to work going about 60mph and I feel a "klunk". As I tried to accelerate, my rpms were rapidly dropping, then I felt the engine cut. I popped it into n and had to make my way across the 3 lane highway. Coasted to a stop on shoulder and observed smoke from the engine compartment. Upon popping the hood, there was a small engine fire which I was able to extinguish. There was oil all over the place. Behind the engine, on the serpentine belt, on the radiator. It wouldnt crank so I had it towed. Auto shop called and stated "we checked the oil levels and it was at the l line on the dip stick. Tried to crank it to no avail, then tried to manually crank it as well. Upon further investigation, we noticed a hole in the engine block, with a piece of the engine missing. You are definitely going to require a new engine. " specifics, I have no idea what the issue may be.

July 2016, while hwy driving my 2012 kia Sorento (v6) (@69,000 mileage) the car abruptly stopped & smoldered (police called fire dept). Car was inoperable, towed to shop & then to kia dealership who advised that radiator cap melted & they found "metal in coolant & the engine" (as noted on the kia dealerhship documentation). He said he never saw such a thing. Dealer said engine needed replacement because of the metal found in engine & metal likely caused overheating which melted rad cap. Kia dealer installed new radiator & a used engine (w/43k mileage), costing me $14,000. The car has continued to make a knocking noise and recently 7/2019, @122k miles again smoldered & lost power. Radiator cap again "melted" requiring a 3rd radiator replacement. Gauges/dash showed no indication of car overheating. I fear problem is recurring with 2nd engine (same defect). Learned of 2012 Sorento recalls for exact issues (metal in engine, overheating/fire, knocking & power loss). Kia dealer (8/2019) informed me only 4 cyl units were recalled for metal in engine & my 6 cyl unit with the same engine-metal issues was not covered by kia recall. I asked if anything related to car use or maintenance would have caused metal to contaminate an engine; dealer said no, problem is unrelated to car use or maintenance and a mfg problem was the only way the metal would show up it. But because there was no recall on the 6 cyl models repair costs were mine. They refused to contact kia. My vehicle has the exact same problem as the 4 cyl models & it's a unique defect known on numerous kia models. Kia dealer acknowledged my impeccable pm & service reord. They admit this problem would not be due to vehicle care or use, & know the problems w/ my 6 cyl are identical to 4cyls. I believe kia may be underreporting the problem & failed due diligence to identify same defects in 6 cyl models.