Home Mercedes-Benz E220 Mercedes-Benz W124: 1986-95 Owner's Bible™
Using a clean syringe, remove all fluid in reservoir.

Although exceptionally strong and reliable, E-Class cars need regular maintenance, such as power steering fluid and filter replacement.

Chapter 3: Maintenance
page 113

Technical Discussions : Thread List - E-Class 1986-1995 (W124)