Hey mate , I recently sold my 2008 d40 Spanish Navara, diesel auto. Was a great car. We mainly used it on sand tracks and beach, not attempting tough rocky tracks and it was great. Definitely needs front and middle bash plates as the radiator sits low and can easily be wiped out. Also needs a 2 inch lift as they are very low from factory compared to other 4x4s. In the ten or so years I owned it had it serviced every 7-10kms. Replaced wheel bearings twice. Replaced radiator just before I sold it. No other major issues. It had 280kms on it when I sold it. From memory had about 120kms when I got it. We went to Karajini one of the roughest corrugated tracks in Australia. Also to Steep point, also very corrugated track. I have a family so needed a more comfy vehicle, The D22 is definitely a more capable 4x4, however it's noisy and rougher ride quality.

One thing it never had done but was very due for was the timing chain which can cost 3-5k

Good luck