In 5 years time, our 126 has always had a faint spooling sound, and now that the 123 has the rebuilt turbo in it, the sound and sound level is the same.

I have no idea why or how it is taking place....but it is.

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it