Root cause of high oil consumption in VEA diesel engines?

[Adndy]

Originally Posted by Sotosound

Your frequent oil changes and loadsa mileage might well have staved the issue off.

My 2014 V70 D4 was fine until recently. It has 152,000 miles on the clock but I've dropped from 25,000 annual miles to 10,000 with more short journeys and less motorway miles, and it's possible that this is allowing the overly small drain holes in the oil control rings to clog up. Now it needs 0.5l ever 2,000 miles. Not huge, but going in the wrong direction.

The question is whether anything other than expensive major surgery can retrieve the situation.

I think it is a real shame the VEA D4 engine has these serious issues as it is a very refined, smooth and quiet engine. Even with nearly 180,000 miles on it my car is still very quiet. Sure you can tell its a diesel but its very smooth.
I assume only a strip down to the engines gubbins is going to repair the blocked holes? An engine flush or something similar wouldn't be able to deal with that?