if you replaced the cam look at the camshaft oil seal the oil can piss out here under load if the the running surface between the cam and the seal knife edge is not glass smooth and it runs down the inside of the cam cover and the goes all over the place and it then looks like the crankshaft oil seal is gone or the sump gasker is leaking.
also the turbo to sump rubber return pipe must have hose clips on it were it connects to the sump and the main turbo drain pipe and also make sure the pipe is on tight and correct without rips.when you give it large it pisses out here also and it give the impression that the sump gasket is leaking.
these two problems caused me a small bit of after a rebuild