The V8 diesel LC's are really fuel hungry beasts. Extremely so. They seam to be better than the 100 series they replaced in pretty much every way except on the economy side from what Ive been hearing..there were a few problems with the early 4.5 engines but I think they'd have that sorted by now, but I am not up to date with that.
As far as unbreakable drive trains go the LC200 would have to be bullet proof...and Im yet to hear any problems with the suspension, but pretty much everyone I know with one has tossed the standard suspension and fitted after market. The entire drive train was beefed up for the 200 series, substantially.
The 100series 4.2TD is tried and tested and will be a hard engine to beat for longevity, fuel consumption and just a great all round work horse..this is the first 4x4 I have owned with an auto and it was the best decision I made...it kills a manual in every situation. the only time a manual is better is if you have to rock it out of a bog......bit tricky with an auto, but hey....thats not much to sacrifice.....great work horse those 5 speed autos, as long as you are not an idiot with them and try and roast the oil in them towing 4 ton up a 45 deg incline over erosion mounds in high will do that to the oil, in low it will do anything asked of it and wont skip a beat.