My car had its first service yesterday since I owned it. I wanted an oil change to see if that cold start rattle went when firtst fired up from cold in the mornings. I have just been out and tested it and it's still got it. It's nothing to worry about Vauxhall said as most cam chain cars do it till the oil reaches the tensioner they said. I got this info on paper from them saying it's normal. It only happens for a few seconds then it's clear. So I should be ok they said lol. It's funny how my other Vectra never did this, that was a pre facelift Vectra C. At least I can relax