hi folks, i (we) have been slowly leaking motor oil down the outside of the turbo oil drain. first i just tightened the drain bolts - no change. today i removed and cleaned the drain tube and replaced the drain gasket - no change. so... what else could it be? a pinhole leak in the hard line? any suggestions, i will check out right away! thanks.

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'77 240D, 504H, OM617.952, etc.