I was afraid that you were going to say that.
It seems to be quiet when first starting out (cold). Because of this, would you think that changing the lube would help? Perhaps a heavier weight oil? I hate to junk the car as otherwise it is great, but this howl is damned annoying.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles