Newbie to this, but need some help asap. We are looking to buy an smax 2.0TDCi 07 reg. Great car, apart from what can only describe as a 'winding down' noise from engine on turning off ignition. It is quite loud from outside of car. We had a test drive with the owner, who said since he had it(sep10), it has always made that noise. Have not noticed this on any other smax we have had a test drive in. Help! We really like this car, but want to know if we are buying into a major problem! Thanks.