Problem was that car would not crank. The dash lights and accessories worked. Repeated attempts eventually succeeded but I didn't want my wife to get stranded (her car).

A very slow crank suggests a weak battery or a poor connection from battery to starter to ground. Be sure to check the ground strap from engine to chassis. Could be a bad starter (worn brushes) especially if original at that milage.

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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