my mpi had the best part of 150000 miles on it when it died. i checked the oil at a motorway services on my way to pick up a dead p38 and it was ok. 100 miles later with the p38 on a trailer behind it the oil pressure light flickered on on a corner. put 4 litres of oil in it to bring it to max (oh dear.) and finished off towing the p38 home, which involved a lot of low range 1st gear pull aways and 2nd gear high range long pulls up duel carriageway hills.
end result was clouds of blue smoke on full throttle and lots of oil consumption..
long story short, they're ok as a solo and off road toy but don't try towing 3.5 ton behind them... they don't cope well.....