I'm sorry I caused some confusion. Of course IXS is ex-CRX, it is an RJ100 and the old incident was an RJ85.
I agree that those two incidents might not be the only one (although I don't have any numbers). The ball bearings of the Lycoming engine is often losing oil, that's why smoke or "bad socks smell" is pretty common on this type - you all know the court cases of passengers and cabin attendants. But obviously the Avro is not the only aircraft with this problem.
Dani