Not anymore,There is a bulletin 11 05 87(1419 that (archive)
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Posted by Bill R. on April 29, 2001 at 17:44:11:
In Reply to: New clutch fans go bad because, posted by Kenny on April 29, 2001 at 17:26:29:
(posted from: cx800837-a.tucson1.az.home.com (24.177.218.119))
states it is no longer necessary to store viscous fan clutchs for bmw in a upright or angled position. This change is due to improved seals in the fan clutch assembly...This was published in october of 87..they're not stored in a proper position... They have to be stored in an upright position, if they are stored laid down, they go bad after time...
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