Engine Burning Oil problems of the 2015 Kia Motor Sorento

The engine burns oil fast. Regular driving after we bought it was ok. We started hearing a mystery crunch noise, but it was a road trip that made the oil problem apparent. We took a trip of 300 miles. At the beginning of the trip the oil was full, when we got there it was almost dry. The crunch noise increased. We took it to a mechanic at our destination and he filled it up again. Thr crunchy noise was gone. When we got back home after driving 300 miles again the oil was at low level. I am afraid to drive this car with my kids in it. I will check my oil everytime I drive but thay is not sustainable. I worry what else is wrong with this engine.

At approximately 70,000 miles, problems began. First noted the coolant container was contaminated with oil and sludge. Entire system was sludged, did not know why. I had the system completely flushed and all new fluids replaced. 2 weeks later, again, the sludge appeared and coolant container filled with oil and coolant hose burned through due to the oil. The coolant hose was replaced. And again I had the entire system fluids flushed. Again, the same thing happened with sludge but this time as I was driving the car 2 miles from my home to a main street bank, smoke came from the hood. Opened the hood, smoke coming out from engine, and a sludge substance exploded throughout the car and oozed out of the car. Could no longer drive the vehicle due to engine seize concerns. Car was meticulously maintained- oil changes regularly, inspections etc. I was told I'd have to possibly get a new engined, or at the least have two head gaskets replaced at a cost of $5,500. Despite kia touting the 100,000 mile power train warranty, and after weeks of trying to get the dealer to fix it, then went up the corporate ladder speaking with corporate, I was finally told that the warranty did not apply to me because I was not the original owner!!!! this despite the fact that I purchased the car certified pre-owned from the kia dealer and was told that there was a 100,000 mile powertrain warranty that applied- that this was a selling feature!!! I could not drive the car for a couple of months while I tried to resolve the issue with kia- but they refused. There was a 2014 recall on the same car, and this car was a 2015, manufactured in 2014. I owed $9,000 on the car!!!! needing a car, I bought a used Buick for $2600 to use since it would be cheaper than renting a car, and will sell that car when needed. Can't upload the photos and the repairs info at this time.

The SUV has been having white smoke coming from tailpipe and the car has been pulling. It makes ugly noise when we try to accelerate on the freeway and pulls. The oil light isn't coming on to tell us when the oil is low even if it's not time for a pil change. We seem to notice that the car is burning oil more frequently than a normal vehicle. Also notice sludge when we check the oil even if we had just had a oil change it seems to come back. The dealer keeps telling me there is nothing wrong with it. They tell me they can't find anything wrong.