Here are 5 videos specifically covering the more important tests and maintenance that should be done when aquiring an older Mercedes diesel. 
CLICK Below to watch each video:
- Compression Test - Here I show how best to do a Diesel "Stress Test"
 - Throttle Linkage Inspection, Service and Repair
 - Full Fuel System Service - Does your engine seem to be losing power?
 - Bye Bye Annoying Vibration
 - Door Lubrication and Repair