hey guys. Got bluish, grey smoke coming out of exhaust on start up for a few seconds. Been doing it for a while. Took it to vauxhall and they said it was headgasket. Had it done and now doing it again. Engine run's perfect apart from that. Also using a little bit of oil too. Any ideas? Doing my head in. :-( just had a vxr turbo fitted by them about 2 weeks ago and still running it in.