the link between the rising oil level and the DPF blockage

 Many Asian diesel cars, including Toyotas, Subarus, and Kias, share similar DPF-related challenges. One common problem is a rising oil level. This happens when diesel fuel gets past the piston rings and contaminates the engine oil.

Why is this a problem? Because these vehicles are designed so that if the oil level rises excessively, the DPF regeneration process will be inhibited. This is a protective measure. It prevents potential engine damage, but it also leads to DPF blockages.

https://youtu.be/qlhH1ci7Veo