Those kia/hyundai engines with issues (theta ii) are based on mitsubishi engine (4b11t) that don't have any issues. I think the issue was added gas recirculati

Those kia/hyundai engines with issues (theta ii) are based on mitsubishi engine (4b11t) that don't have any issues. I think the issue was added gas recirculation, which made the engine run hotter and causing a negative feedback loop ending in piston rings getting clogged with burnt oil and scraping the cylinder walls.