"Especially a 15 year old import, for which parts are likely to be rare in scrapyards and expensive new."

The price of parts depends entirely on which engine is fitted.

If it is the 2.8 four-cylinder turbo intercooled diesel the parts are readily avaiable new.

example - new built up cylider head £390.00 +vat

www.milneroffroad.com/mitsubishi-japanese-import/p...2

Theoretically under the new 2015 Sale of Goods Act if a fault occurs within 30 days the buyer has the right to reject the goods.

But getting the money back is not going to be that easy in the case of a 15 years old car.

It is the buyers responsibility to return the car to the seller but they may be able to claim the costs if the vehicle had broken down.

You need some good legal help from a specialist solicitor which will cost.

Best of luck, you will need it.