ran a vectra c cdti 150 for 6 months/32k, mixed journeys of short town runs and longer motorway blasts. had a few issues:
1. overall mpg was less than 37 :-/
2. needed inlet manifold and egr valve replacing at 15k, as sooted up.
3. rear callipers seized on both sides, cooking rear bearings. pish design cheap to make...

4. handbrake was intermittant. (see above).
5. never idled properly, whether hot or cold.
6. was booked in for another egr valve and inlet manifold as sooted up again when i put out of its misery permenantly

the only vectra cs that have proven themselves have been 1.8 petrols, 65k in 15 months, only ever needed oil/filters, tyres, brake pads and drop links.

only downside is 30mpg. :-/ though that is still 7mpg better than my mig
p.s. 2.2 petrols have fuel pump issues. they hate cheap fuel, and as most people fill up when they go shopping, you will at some point be looking at a new fuel pump. these have more in common with modern diesel fuel pumps than say a mig one.
