I own a 3.0CRD Patrol. the car is great and is also used as a daily drive. I get between 6km/l to 9km/l depending on load and how I drive. it out performs the 4.2 turbo (the fastest one I know of on the forum anyways). My Patrol is also heavily kitted and weighs 2.8tons without me in it.
Unfortunately the first generation ZD30's had such a bad reputation that all is scared of anything that says 3.0ZD Patrol. so in SA only the BRAVE drive them. on the AUS Patrol forum they swear by these 3.0CRD Patrols. 3.0CRD Patrols running in Aus with access of 300 000km's. with out any issues.
I however did all the mods required to keep the old ZD30's running just for encase. I am not going to list them all know but you can just go through my posts.
what we mean by ZD30 CRD is that after 2007, Nissan completely changed the ZD30 Patrols fuelling system, computer or ECU, fuel pump and head. they run on more advanced or up to-date fuelling systems with common rail. I made a whole post of this as well. you can PM me you email address then I can send you the Nissan PDF on the changes as well as the reference doc. that explains all the older ZD30 issues and how to adjust your Patrol to compensate for those short Cummings.
their are a few guys here that have older models like Stefan. and his is still going strong with well over 200 000 km's. you must however take note that SA is slow on Patrols sales. so if you find a 2008 model it doesn't mean its a CRD. you must make sure before you buy. someone on the Forum has a 08 model and its still the older ZD30. I don't know what your budget is, but if its less than 200k your safest bet will be a 4.8. Tinus ran the daylights out of everyone in the river bed with that 4.8. I still need to get him on tar with heavy load, so that I can scare him a little
good luck with making a decision. and happy hunting.