i have just taken delivery of a new ML320 Diesel. My problem is that when th car is incresing speed with the foot on the accelerator between 15 and 65 kph there is a small squeal type noise, if i take my foot off the throttle the noise disappears the noise seem to be directly related to the foot and pressure speed on the throttle, at 65 you do not hear it..Any Ideas...Merc. have had my car back for 14 days and are no nearer to solving the problem.