I used one of these filters, I got it from the local BapGeon Foreign Auto Parts stores in town, $1.75 each.



Here's the instructions on where to place it
http://www.mbca.org/pages/tech/MBCA_diesel_run.htm (It's down towards the bottom.)

It should be placed on the vacuum line to the brake booster.

__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.