Many Kia vehicles have a Theta II, a gasoline direct injection (GDI) engine that is well known for having oil flow issues that eventually cause catastrophic failures.
The Theta II is a gasoline direct injection (GDI) engine that is well known for a lot of things and none of them are good. Bearing failure, metal debris riding on contaminated oil, piston ring defects, siezing, knocking, crying.
It took a long time, but Hyundai and Kia eventually admitted that metallic debris might have been left around the engine crankshaft during manufacturing. That can cause hell on your engine when it comes to oil flow.
In June 2016, a Kia Theta engine lawsuit was filed for owners of the 2011-2014 Optima, Sportage, and the 2012-2014 Kia Sorento.
A Former Engineer Spills the Theta II Beans
A former Hyundai engineer told the National Highway Traffic Safety Administration (NHTSA) that Hyundai was well aware of the Theta II problems, even as they denied it publicly and pushed against a recall.