Errm, we are a **** take group (just in case you had a brain bypass), an you'll realise the "cretins" who are ripping you to **** actually do know what they're on about, but you have to speak the LandyZone Lingo. Have you ever worked on an engineering shop floor? If you have, you'd have understood the level straight away. No PC, give as good as yer get an somewhere the answer to what you asked is presented (via a load of drivel and thread-jacking).
So, A P38 eh? Do NOT go fer anything prior to 2000MY or you'll regret it. Diesels are gutless and prone to same electric faults, 4.0 is OK, but watch the thermostat unit and inlet preheater - known to fail regular an can be a **** to sort (I know). Full engine rebuild every 100k miles an you should be OK providing the electrics last that long.
Helpful? If not then **** OFF AN GET A LIFE