You couldnt afford to change even if you wanted to
. At least you still got your sense of humour - dont know if i would had it been my car !!!
Dont know if there is anything specifically changed as the year models went on. Pretty much the same for all of them as far as i know. Also check the air con works. Check the air con compressor where the coupling joins it to the back of the power steering pump. The bearing in there is known to kark itself. Almost certain is leaking oil from diffs/gearboxs - when it stops leaking you know its time to top up
This is pretty much a list of all the crap thats gone wrong with everyones diesels !!!!!
Tell yr mate to buy a landcruiser instead ;p