those rotaries are back when they were built well. These new Renesis rotary motors are total junk. For some reason Mazda wanted to make the Apex seals smaller (2mm to 1mm) and that causes problems. Plus the oiling isn't sufficient... #2 rotor will go out easy. Our shop foreman is the only one to work on rotary motors. He can R&R 3 in a day. Too bad Mazda won't let us stock motors (Controlled item). Customer has to wait and we do too.