Dear Peter,
1. Some of the glass rubbers were looking a bit cracked (rear side
> windows) and there was signs of rust at the bottom of one of the > 'skylight' windows.
About 4 months ago I bought a 10 year old 200TDI auto with all the same symptoms as yours. The cracked rubbers I sealed with translucent bathroom sealant which worked a treat, though you should be able to have new ones fitted if you feel like it.
2. What is the realistic fuel consumption of the 200Tdi. How does it200TDI... about 30 (uk) miles to a gallon if you drive it sensibly. here Diesle is 76.9 pence a litre - its bl**dy daylight robery! Don't know about petrol though a friend said his Range Rover 3.9 v8 auto does about 8 miles to a gallon!
> compare to the V8 petrol? Our fuel is still only 30pence (one NZ dollar)
> per litre so petrol may be less crippling than in the UK.
Do the diesels require more regular maintenance than the petrol
> engines? I'm used to a car where I just change oil and replace tyres.
Not as far as I am aware. I think the service interval for a 96 disco is annually or 12000 miles... On the older one like mine it's 6 months or 6000 miles. When you buy it, check the air filter. It's condition is a good indication of how the car's been treated/serviced. If it's filthy and caked in muck (as mine was) you know it's not seen a service in a long while!
4. I tried the low ratio selector and it seemed hard to get into low and
> back to high, then it jumped out of high. Is there a trick to this (I
> was stationary in N) or are they just awkward or is this a bad sign?
As far as I know they /are/ just awkward. you do seem to have to put a little effort into changing them. They seem to be the same on all landys. I drive some very old ones around my local airfield and they are just the same. I think the gearbox design probably hasn't changed much over the years. basically high and low ratio gears are fundamentally designed for tractors/agricultural vehicals and /feel/ pretty much the same. (IMHO)
best wishes Gail