I have a Briggs 49M977-1036-G5 2013 that giving me fits.
Two year I replace sump gasket as oil was leaking and the gasket looked like Swiss cheese. This year it back with the same problem. Replaced the gasket again and the customer made a few rounds and the illiterately blew the gasket out again.
I pretty this a crankcase problem but just want to see if others has the same opinion that I might have bad positive crankcase vent valve that is failing to open or could something else being going on.
I have yet done a leak down test for a bad head gasket but on the list to do this time around.