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Welcome to the forum! We have a lot of useful knowledge here. The Google search function is especially good at finding previously posted answers to your questions.
The glow plug relay light will indicate a bad glow plug if is #1 or if it is two or more other than #1. This is because the relay compares the current through #1 with the average current through the others and it usually takes more than one bad one to drag down the average enough to be noticed. If you have only one bad glow plug (and not #1) the system may not "notice." After 30 seconds or so, the bad cylinder starts firing on its own and thee engine smooths out. Your car also has afterglow (the glow plugs stay on for awhile after the engine starts) but that won't help if a glow plug is bad. There are other possible reasons for your problem but that's enough for post #1.
Jeremy
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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
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