It really depends on how new the engine is.
Diesels that meet Euro IV are a lot more sensitive to fuel quality hence they have to have electronic matrickery to deal with shit. If I put supermarket fuel into mine, pretty much every time I get about 20 miles down the road and get a "bing" and a message on screen saying "warning! reduced performance mode" and the car won't rev above 3000rpm or drive above 55mph until I refill with better fuel.
( the mighty badger Aphrodite, on a bar stool, by your side, Tue 20 Nov 2012, 10:54, 1 reply, 13 years ago)

Your car is a screaming gayer

( sporters I’m sincerely gratitude to you, Tue 20 Nov 2012, 10:56, Reply)

I imagine instead of a ingnition key, there's just a smooth set of balls he has to tickle correctly

( glued eel /questions/questionsyoudliketoask/post1648081, Tue 20 Nov 2012, 10:58, Reply)

hahaha!
2 stroke
( sporters I’m sincerely gratitude to you, Tue 20 Nov 2012, 10:58, Reply)

Actually I have to rim the ignition.

( the mighty badger Aphrodite, on a bar stool, by your side, Tue 20 Nov 2012, 11:04, Reply)

Absolutely.

( the mighty badger Aphrodite, on a bar stool, by your side, Tue 20 Nov 2012, 11:02, Reply)