[Jake Raby]

You could also have an obstruction inside te engine oil passages that return the scavenge oil from te cylinder head into the crankcase and then down to the swirl pots to be defoamed.

We see intake valve stem seals go bad that cause as much oil consumption and chamber contamination as anything else, which is something else to consider.

The pumps are also installed incorrectly in their bores or the body is disassembled and phased incorrectly into the housing. If these things happen it won't move any oil.