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Owners Manual has instructions for resetting oil dilution ratio. Reads like cracking a safe but should be straightforward enough. The same oil as Subaru use Castrol C3 I think.

I too have flashing DPF light as well as permanent glow in my 2010 diesel outback. Owned car since new and has happened at least 10 times, usually after a service. Return to dealer to be told maybe driving or dirty fuel problem but don't think either the case as mainly highway driving at 110 kph and...