Hi guys

my 2.0 tdi BRE (210000 miles) recently started making a lot of noise which i suspected was the DMF, so i have replaced the clutch and flywheel but the noise is still there. I recorded a video, not sure if it'll help with the diagnosis.

A4 B7 BRE noise from engine - YouTube

From researching am i right in thinking this could be the start of the oil pump hex failing? The car still drives ok (although seems sluggish in 1st\2nd) and i have never had a low oil pressure warning. Any help would be greatly appreciated.

TIA