Okay, so this is the official start of my asking a lot of questions. Some will be very dumb I am very green to this MB diesel thing.

My commute to work is 4 miles of easy driving, 15miles of highway, and 4 more miles of easy (~30mph). I look at this as the perfect commute. Warm her up, stretch her out, and warm her down. Anyway,

On the highway, when I (gently) accelerate, I get the turbo whistle. But It is still noticeable at cruising (65+-) speed. In fact I would say it is almost constant. Not always there, but usually (I almost feel like I can make it go away if I ever so slightly ease up on gas, but keep the same speed, if that makes any sense). If a take my foot off the accel. it immediately stops, and it is less intense than the accelerating version. But still there. Is this normal? Harbinger of anything bad?

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1981 300TD
1985 300TD