There are two root causes. First, the PCV valve fails, allowing oil mist to be sucked directly into the intake manifold. Second, the low-tension piston rings (installed for fuel economy) become clogged with carbon and sludge, losing their ability to scrape oil off the cylinder walls.
Like all GDI engines, fuel never washes over the intake valves. Over time (often 30,000–50,000 miles), baked-on carbon restricts airflow. hyundai 10 tgdi engine problems
Because this is a engine, fuel is sprayed directly into the combustion chamber rather than over the intake valves. Without fuel to "wash" them, oil vapors can bake onto the valves, forming carbon crusts. There are two root causes
A primary concern for the 1.0 T-GDI is premature timing chain stretch. Although designed to last the life of the engine, the chain and its tensioners often show signs of wear as early as (approx. 25,000–37,000 miles). Like all GDI engines, fuel never washes over