Hi, I am driving the European/Japanese version, Pajero Sport with the 2.5 liter turbo diesel engine. Just hit 200k km ~ 125k miles and the motor works as new.
I was thinking to swap with 3.0l gas engine but it's too expensive to do and does not really going to cover future expenses.
The whole that swapping is just too hard! If you would want to upgrade from one gasoline engine to another it's much easier, see the electrical installation is almost the same, just change the ECU, motor and should work.
That does not quite stand like it with the diesel, you even have to get a new hood (there's a whole on it for air to get to the intercooler), there are gadget on the dashboard, that I am not sure the gas versions has. New electrical instalation, new transmission tons of stuff.
Around here we convert gasoline engines to work on propane/natural gas. It's 2 times cheaper than a liter gasoline and there's not much lose of power (that's what I would do if I had a gasoline engine).
By all i said I mean that for me this conversion is not worth it.
Regards, D. Dimitrov