Diesel is coming into the motoroil?

It’s extremely likely that the shaft seal on your CP1 fuel pump is bad, as that is the only fuel component which is directly connected to your oil passages. If an injector was leaking while driving , enough to gather over 300 ml of fuel in the oil, that cylinder would not ignite all the fuel and you would experience a LOT of smoke and poor idle. A leak down at rest would also occur, and although it would not drain enough fuel into the cylinder to cause a hydraulic lock up, it would certainly make for an uncomfortable and smoky start.

Have a shop connect a pressure tester on the rail, start the motor and then turn it off and watch the rail pressure. It should take a considerable amount of time significant loss.