The indirect injection Cyclone V6 in the 3.7 Roadster has another crankcase breather variant. The main breather is on the right hand cam cover to base of inlet manifold immediately above, so only a short pipe needed with integral non-return valve. The left hand bank breathes the opposite way with a feed into its cam cover. This is achieved by a longer pipe from inlet tract fitting, located after air cleaner but before throttle body, feeding to cam cover. The relative pressure for the most part is going to be higher here than at manifold hence general breathing flow from left to right bank, and no need for non-return valve on this side.
FWIW when I checked this pipe there was no trace of oil or residue at either end, as to be expected.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone
