[QUOTE=Arthur Dalton;1815915]Try this first

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42C90UZQ2B&year=1989&make=MB&model=300-TE-001&category=M&part=P%2FS+Filter[/QUOTE
What is this? What does it do? Where do I put it?