The engine in my newly purchased 1999 300D is producing a whine on the driver's side. I'd just like to know whether it's anything that I should be worried about and if it's correctable. The whine gets higher in pitch and louder as the rpm's increase, and is particulary noticeable, at least to me, between 1600 to 1900 rpm from inside the car whether the car is standing still in neutral or cruising down the road. I don't think it's the turbo unit which is located on the passenger side of the engine and I think produces a higher pitch sound which is almost unnoticeable.

The engine runs smoothly all the time and doesn't hesitate on acceleration, and doesn't smoke unless I really push it, so I don't beleive anything major is wrong. But I've heard so much about noisy fuel injectors on diesels I was wondering if it could be these making the noise. I don't know what noisy injectors sound like. Or, it could just be the nature of the beast.

We've also had a 1993 300D in the family for some time now and that car doesn't make the same whining noise.

Your comments will be appreciated. Thank you.