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I never understood why engine manufacturers routed blow-by gases back into the intake manifold. All the oil vapour (read : Oil) gets trapped there and completely clogs the throttle body and intake manifold causing sluggish performance, inaccurate idling and in some cases engine dying off due to overly low idling.

In order to counter this problem, some budding aftermarket enthusiast created the Oil Catch Tank (OCT) and connected it to the PCV valve catching all the oil vapour therefore...