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You mentioned a little back in the thread that you intend to have your tech perform a wet and dry compression test.
The proper method to use on a diesel engine is a compression and a leakdown test. A wet compression test uses oil to seal the rings, and thereby determine whether is be rings allowing a loss of compression, or by default the valves.
Problem with the high compression diesel is that added oil to the cylinder will cause it to start running on occasion. It can then run away out of control until it burns up all of that oil, that it is using as fuel. Not a good thing to have happen to your car.