Actually is recommended. It's a lubricant, it's a cleaner and it lowers emissions so why would you not use it.
Your Montero is still a old school diesel it does not meat the 29000psi threshold for the cutoff for using 2T oil. I always go on facts not opinion.
http://www.diesel-art.com/manuales/M..._triton6Ad.PDF You make 180mpa which is around 26000psi.
Only a few high end cars have pressure high enough and that were designed for EURO 4 fuel will not need it. The newer KIA common rail diesels are about the only exception to the rule. They are just over 29000psi to squeeze power from a smaller displacement engine.
Put it in, run it and see if you can fell a difference. But it's not in anyway going to hurt your engine.
And yes you can use it in the rangers engine and the Everest common rail engines. They only make 23000psi.