I've owned a 1979, a 1987 and currently own a 1994 RX-7. I've done maintenance using dealer shop and small local sports car shops. I've not had to replace any engines although a dealer suggested I do exactly that plus the twin turbos for $11,000 20 years ago. Current mileage is 142,000, Car has all original parts. No modifications of note (antenna doesn't count). Recently had to replace … hoses to engine and turbos after so many years but no major repairs have been incurred. Might go on auction in a month.