Hmm, I can't check now but the e39 CCV on I6 engines is only around 1 hr to replace if that. $850 sounds awfully steep!
I wish BMW would simplify matters. This CCV just doesn't work in most climates, only where it's very dry and above freezing most or te time.
Sent from my iPhone. Please excuse typos and lack of links.
'99 528i ('98/12 build). 282,000km BY29428/Royalrot
Breaking My Wallet since 2009
Mods: Stoptech SS brake hose, 280piece toolkit resting on trunk floor, Beisan VANOS seals, increasing amounts of duct tape and glue
'99 540i (grandfather's)