Cm2250 oil leak driver side behind air compressor?

[Waterloo]

Could be your upper housing/cover, on the front of the motor. There is an O Ring gasket behind that front cover. The cover that sits behind the engine fan, where your cam gear/timing chain is located. These leaks are funny, I had one on my fresh in frame motor, lower cover, long story, but the dealer fixed at no cost. OR, the seal at your cam is leaking. No way to check without tearing apart a few things. But, those leaks usually appear at the top of the motor, at least on the CM-870 and 871 motors... You have one cam, but something to look at. No idea how to check, but I would know one if I saw one. I had this issue on my 870, wish Rawze would have been around back then.