One of the best diesel cars I had that was cheap was a Vauxhall Astra 1.7 DTi.
For £2k, you'll probably get either a very low mileage DTI or a mid mileage later CDTi, they're bombproof engines in my opinion and have Isuzu engineering.
I ran my from 124k to 150k with litterally nothing going wrong with it. I used to get late 50s MPG and on long runs I got up to 70mpg occasionally!
Best thing to do though at any older diesel car is look at condition, and service history and DON'T get hung up on age or mileage too much.
Edited by British Rail Guard on 12/08/2013 at 23:59
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