The contact owns a 2021 Kia Seltos. The contact stated that while driving at an undisclosed speed, the vehicle failed to accelerate as intended while depressing the accelerator pedal. No warning lights were illuminated. The contact stated that on a separate occasion, while driving, the contact noticed an abnormal burning odor coming from the engine. The contact checked the oil and found that the engine was low on oil. In addition, the contact stated there was an abnormal sound coming from the engine. No warning lights were illuminated. The vehicle was taken to the dealer; however, no cause for the failure was found. The contact stated that the failure persisted. The contact stated that the engine was consuming an excessive amount of engine oil and the piston rings had failed. The vehicle was not repaired. The contact stated that the last time the vehicle was at the dealer, a document was signed stating that the vehicle had passed the oil consumption test. The contact stated that the document was signed under duress because the dealer would not return the vehicle unless the document was signed. The contact related the failure to NHTSA Campaign Number: 25V099000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The manufacturer was not made aware of the failure. The failure mileage was unknown.