It's interesting that the factory doesn't give a service interval for power steering fluid changes. The "E-Class Owner's Bible," while noting this, suggests every 30,000 miles for the fluid and twice that for the filter. The "Mercedes-Benz Technical Companion" describes the procedure for changing fluid and filter on a 126 although they don't mention intervals.

Since it's an easy and inexpensive procedure, why not change it every couple of years? It also gives you an opportunity to look over that area of the engine bay. Maybe you'll spot a problem while you're in there.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970