well had my astra sri 150 for a year now. still love it to bits. just had a few problems .
new egr valve fitted, inlet manifold and swirl flaps
all seemed ok after that but now its started to produce blue black smoke on a cold start, and even when its warm it puffs out a blue black smoke.
so it looks like a trip back to the dealer to take a look.
last time it went in there, it was off the road for 4 weeks