I purchased a 2005 model cabriolet, passion ( the convertible version) metallic red with grey and a grey interior. This is a 3 cylinder turbocharged diesel and I get 65 miles to the gallon. It has plenty of pep for a 40 horsepower engine, especially when using the 6 gear manual option. It runs great but I have a question regarding a buzzing noise which comes on intermittantly when driving. It is the same noise that you hear when the glowplugs are heating up the cylinder prior to starting the engine. Since this is winter, and the diesel is cold, could it have anything to do with preheating the fuel? When I took the car to the dealer it would not buzz. If anyone else has had this experience I would appreciate a comment. Thank you, Karl