You might check out the SEARCH facility on this site for what you're looking for. Another source for fluid/filter
type maint. would be:
Mercedes-Benz Maintenance Manual Model Year 1981-1993
The folks who runs this site may have it. If not, go to:
Costs about $50.00 + shipping
More adventurous tasks will require the 126 Cd-Rom which the PartsShop carries. I seem to recall also seeing the maint manual within the 126 Cd-Rom.