Codeman is correct. Eventually all I/O outdrives will need to be rebuilt or replaced but that would be true of all outboards & inboards also, just like a car engine does not last forever. How you maintain your outdrive can affect how much trouble free operation like anything mechanical.
Having said that I will say that Fourwinns did use OMC I/O engines when they were in production because OMC owned Fourwinns before filing bankruptcy. OMC stopped producing I/O engines I think due to many problems with the engines as well as stiff competition from Mercruiser & Volvo Penta. But if that is the first rebuild that 87 needed then it was probably on borrowed time anyway. Probably not due to any problem but just old.
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