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Oil catch tanks are only useful in hi-boost and old worn out engines. They catch oil that can inadvertently be sucked into the intake by blow-by gases pressurizing the valve train area of the head. Maybe it's just me, but under high boost, is not the intake manifold/plenum underboost as well? When pressures are the same on both sides of a manifold they are considered equalized. When one side as a higher potential (pressure) then it is considered differential. Ok, so the entire intake past the compressor is pressurized. Got it. Pressure goes in, energy extracted in the cylinders, and thusly expelled from the combustion chamber into the exhaust. For the valvetrain area to have a positive differential pressure to force oil out you would have to have a great deal of of blow-by pressure in the cylinder. Unless you are boosted over 20PSI or running 13:1 compression with mild boost, I don't see this happening. I have been running 9PSI for well over a year and most of that time I have been running an atmospheric filter to vent crankcase gases. Not drop to be found.
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