"Weird" symptoms are by definition hard to predict. They are more likely to occur in an electronic circuit that is voltage sensitive. I could imagine a circuit that carries a fairly heavy load through an old aluminum fuse that is covered with aluminum oxide and in a holder with a weak spring. The high current through that resistive fuse would drag down the system voltage beyond the fuse and that might cause problems in something electronic powered from that circuit.

In any case, new shiny fuses are always better than old corroded fuses, especially the "bullet" fuses used up through models 124, 126, and 201. I always go through a new-to-me car and replace most or all with new ceramic/brass fuses. It's one less thing to consider when diagnosing a subsequent electrical problem.

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