I owned a 1982 240D for 14 years (1994 to 2008) and put about 75,000 thousand miles on it. It had power windows and all four worked when I got it and never gave me any problem during my ownership. Not even a blown fuse. The point being that the 123 power windows can function flawlessly for many years and many miles. My car was garaged for most of its life, and I believe this keeps the seals in good condition and goes a long way to its preservation.

Just my $.02 worth.

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1976 240D
1987 560SL
2007 E320 Bluetec
1998 C280 (now son’s car)
1982 240D Manual - Sold