got a transporter, 2 litre 140ps, it goes really well....
but I guess at auction you'd be looking at a 1.9 or a 2.5
the 2.5s are really torquey but can be thirsty,
and the 1.9s are alot more frugal, but there have been problems with the dual mass flywheel I believe
that sounds like they are terrible, but they are a really nice drive, and the t5gp is even nicer, but as said, a bit more money....
I have heard of a few 115 transits seizing, and a the 140s put oil in the intercooler
lad with a primastar only had problem with dealers and was pretty happy with his,
and I had an expert (same as dispatch) but they eventually fall apart like all french vehicles.... the paint falls off, the electrics break... but they just keep running..
I got fed up and bought something with loads and loads of warranty... but good luck