I find having to post this info numerous times. So I will post it here so anyone can just share a link when trying to explain it in the future.
There are two designs and combinations of PCV to rear vent/breather tubes.
↓ The Rear Vent Tube PN: 06F 103 215 B; with a check valve, is to be paired with PCV PN: 06F 129 101 P with no check valve: ↓
If you have the open rear vent tube PN: 06F 103 213 N with no check valve built into it (shown below)...you should only use the PCV PN: 06F 129 101 R with the built in check-valve.
Also; if you have a recycling catch-can or PCV delete plate, those should also be paired with the open rear vent tube. As those two configurations need no valve in the rear vent tube and should never be closed.
The two combinations are meant to be paired as such, but the valved rear vent tube will function with either PCV. It will just have a second valve along the recycle route to the turbo inlet.
**Removing the PCV, for a PCV delete or catch-can, eliminates crankcase vacuum. The removal of the "PCV-to-intake manifold" tube does this. 'CRANKCASE VACUUM' improves ring seal and valve stem seal, improves power(yes, crankcase pressure reduces power), and removes and burns vapors more efficiently. Allowing the vapors to linger in the crankcase makes it messier in there. Your engine may experience more oil loss for removing the PCV-to-intake manifold" tube...causing it to smoke more from the exhaust.**
There are two designs and combinations of PCV to rear vent/breather tubes.
↓ The Rear Vent Tube PN: 06F 103 215 B; with a check valve, is to be paired with PCV PN: 06F 129 101 P with no check valve: ↓
If you have the open rear vent tube PN: 06F 103 213 N with no check valve built into it (shown below)...you should only use the PCV PN: 06F 129 101 R with the built in check-valve.
Also; if you have a recycling catch-can or PCV delete plate, those should also be paired with the open rear vent tube. As those two configurations need no valve in the rear vent tube and should never be closed.
The two combinations are meant to be paired as such, but the valved rear vent tube will function with either PCV. It will just have a second valve along the recycle route to the turbo inlet.
**Removing the PCV, for a PCV delete or catch-can, eliminates crankcase vacuum. The removal of the "PCV-to-intake manifold" tube does this. 'CRANKCASE VACUUM' improves ring seal and valve stem seal, improves power(yes, crankcase pressure reduces power), and removes and burns vapors more efficiently. Allowing the vapors to linger in the crankcase makes it messier in there. Your engine may experience more oil loss for removing the PCV-to-intake manifold" tube...causing it to smoke more from the exhaust.**
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