In Reply to: only recommended for hydraulic shocks posted by jay1 on February 24, 2002 at 18:52:02:
Bilstein HD and Sports vent on the bottom which if oil is in the way will affect the operation.
However there are Koni products that you can use oil in a gas charged strut situation.
As best I know, Bilsteins are the only ones that caution you not to use oil in the housing.
Bentley is hardly the bible when it comes to auto repair info.