FWIW, I've used seafoam in my crank case every 3 - 4 oil changes for the last 2 - 3 yrs, & totally eliminated the pcv valve with an oil catch can system that breathers into the air box.
Not much decrease in oil consumption that I can see, maybe slightly during highway only driving.
Will know more when I get to Moab in the spring.
My guess is poorly designed oil return passages in the rings/pistons.
Just some stuff I read somewhere...
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