Hi - any advice would be appreciated please - i have recently purchased a Vauxhall Astra H SRI, 1800, on a 2010 plate - the car seemed fine for the first week or so but now, occassionally, i get a fairly loud rattling sound for 2 - 3 seconds on starting up after the car has been sitting, say overnight - no other time and the car drives like a dream after this - the oil light would also flash on and then go off almost instantly - i was advised that the car could need a flush, good service, good oil, new filters and i have had this done and it seemed to be Ok although I am sure that i heard it yesterday (not paying too much attention at the time as i thought the problem had been solved) although it was nowhere near as loud as it had been prior to the service - please help and thank you