apparently is a crankshaft vent. I replaced my one 2 weeks ago as i couldn't listen to the whistling noise anymore...it sounded like AC on full blast. Easy to replace at £23 cost.
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 Audi A8 D3 2003 3.7 V8 petrol, Oyster gray with black interior
19" alloy, Sport suspension transmission and seats, HID headlights, Phone in armrest, 4zone AC, Sat-Nav, TV, Dimmable exterior mirrors, VCDS
Previous : Chevrolet Blazer 2001 LT 4.3 petrol 
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