I guess it's also possible that with high exhaust back pressure and worn exhaust valve guides you could get excessive leakage into the cam covers, potentially carrying some diesel meant for the dpf with it. The diesel could then be captured in the all the oil sloshing around the cams and make its way back down to the sump via the crank bearing oil supply.
Does Volvo rely on intake vacuum for crankcase ventilation like most cars traditionally do?
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