I used a couple of tanks of B20 in my '87 before going to B100, which I used for over a year, then went back to B20 dues to the cost of B100. No problems with filters clogging, guess my fuel system was already pretty clean.

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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