I understand that the CRD has cylinder liners just like a lot of the OTR trucks and like the Dodge and Fords have. I had a 7.3 Powerstroke that has "wet liners" witch means that the coolant runs right around the liner which causes cavitation. There was a required additive for the coolant to keep it cavitation from damaging the liner. Does the CRD have a similar setup?

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New to me 05 CRD.
Grey Sport

Check your pH. Should be 9.5-10.0.
I have pondered using a water filter like the big rigs, but we don't run 10 to 20 hours per day and the water filters for the big rigs may be too much of a good thing and not be the right amount of additive to adjust the pH.
Make sure the antifreeze you use is good for the aluminum head, it is more sensitive than the wet liners.
Take care of the head and the liners should be fine.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

The coolant itself is special - don't think you need any additives.

http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?t=29347&highlight=antifreeze

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur