I had this issue last year, replaced oil cooler,egr cooler(on autos only)and then head gasket(check number of small holes in exposed part of gasket before ordering new one)because of location I had to reuse the head bolts.also you will need to have the camshaft alignment tool when positioning timing chain sprockets.be careful when refitting injectors-fit the clamps correctly as I put them upside down at first.
All this was to no avail,as coolant was still ending up in sump,so I resorted to putting a can of 'block seal ' in.hasnt been a problem since.
I thought this was due to a water leak problem spanning the life of the car until my ownership,I had paperwork to vouch for this.And therefore internal corrosion had set in.
Anyway over a year now and all is ok,touch wood.
By the way I used a couple of gallons of cheap oil and filters for the first hundred miles or so and replaced crank breather filters.and once oil filler cap didn't have the emulsified gunk anymore,everything was back to normal.
Good luck,Ken .
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