You sold it to him presumably without warranty and usually most people know that when all the dash warning lights come on, the car should be shut off. I'd say give him advice at the very most but belts can break, even right after replacement, cause $**t happens and that's that.

Good luck.

Phil Forrest

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1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson