So I did a liquid moly engine flush, fully synthetic Motul oil 5w-40 change, filter and put in a liqui moly lifter additive. No change.

Tried unplugging each injector individually to see if I could isolate a cylinder. No change.

Only good news at this stage is there was no metal in the oil when I dumped it.

I think I'm going to have to bite the bullet and give it to BMW, if anyone can work it out, they can.

Only thing I can think it could be if it internal is the main crank pulley dampener, or something post torque converter.....it's just so rhythmic that it seems unlikely.

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2005 3.0d Sport - Sapphire Black
Engine : Bluefin Superchip Tune,
Wheels & Sus: Style 168s (10.5s all round), H&R RDA Spacers, Bilstein B12, Eibach 40mm drop, Whiteline RSB
Exterior: Le Mans flares, 4.6is kit F&R
Interior: Dynavin N6, Blackvue DR650 dash cams

My Build Thread: http://www.xoutpost.com/bmw-sav-foru...run-sheet.html