You could probably build one BUT this is a well built and finished product. Installed on my 2017 Mustang EcoBoost, since my last oil change it has trapped 6 ounces of crankcase fumes that would otherwise collect around the intake manifold and valves. It's easy to install. Highly recommended for supercharged engines, but a good idea for any engine. My F350 Power Stroke has an oil separator installed, but I installed a separate collection tank, possibly between the separator and the hall sensor.
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