Hi there
These are big and thirsty beasts... one of the reasons I now drive a Terrano is the lower fuel consumption. I had two Patrols myself and have driven a mates more recent 3L model. They all really drink the juice .. mine was around 15L per 100kms.. and my mates 3L with a chipped motor must be over 18L per 100ks.
My first was a 3.3L atmo, short wheelbase but a real tractor. Top speed about 60 miles an hour but very good off road. Sold that one with 320,000 kms on the clock as wanted a LWB.
Second one was a 2.8 TD (they never imported 4.2L or Petrol models into France). Great car that would climb the side of a house. I drove my for over 200,000 kms and sold it with 360,000 on the clock and it is still going strong.
The issues with head gaskets were usually down to the poor design of the straight six engine and poor cooling. Prolonged motorway use usually lead to issues as the motor really didn't like it. Later models added a second radiator, which helped a bit...
The chassis and drive train were pretty much bullet proof... the main weakness, as was pointed out above, was rust... the bodywork, wings, sill, tail gate, guttering all suffered and usually killed the car before mechanical failure.
If you fancy a left hand drive there's a 3.3L turbo long wheel base for sale on our 4x4 forum.... all the gadgets and in good condition..
http://forum.bivouac4x4.net/forum/viewtopic.php?f=16&t=14820 Only 4500 euros
I loved mine, took me over the Pyrenees with a roof tent and of France & Spain. A real 4x4...
Cheers
Gareth