Ya see there's that metric crap again (hate it always will), 12 litres :confused: . Try 12 U.S. quarts and it comes up to the full mark on a cold engine. I've got a plastic jug from Wally world marked in metric/US and 12 litres is too much. That is why it is pucking out your vent tube. I agree that on our engines the oil takes a long time to settle/drain in the pan after 7 going on eight changes. Hell what's a little blow by better than a EGR or the bottle Cummins used to hang off the tube(plugs,clogs, forget to clean etc.)