Thread: Provent oil drain back into TD5 turbo oil drain - one way valve required?

Yes...

I wouldn't drain the provent back to the sump.
Do a bit of research yourself.
But crankcase gas contains water vapour and oil vapour they can mix and create acid compounds.

Originally Posted by Mal

But crankcase gas contains water vapour and oil vapour they can mix and create acid compounds.

O Rly?
I thought that was the normal mechanism of oil degradation.

Once engine oil gets upto running temperature water contaminants will evaporate and be expelled via the PCV system ,
If you have a catch can in humid environments collect some of the caught oil/condensate and look at it.

Mal I think you’re missing the point..

The PCV system returns the same back into the engine regardless... only the oil vapour is filtered and extracted to go back to the sump.

Acids are a by product of combustion, and once an engine is up to temperature it tends to burn a portion of this off vi the pcv system introducing it to the intake.

The Provent will allow the gases back into the intake to be burnt, just removing the oils etc to the sump - which once warm will evaporate to be consumed by the engine.

Originally Posted by Tombie

Mal I think you’re missing the point..

The PCV system returns the same back into the engine regardless... only the oil vapour is filtered and extracted to go back to the sump.

Acids are a by product of combustion, and once an engine is up to temperature it tends to burn a portion of this off vi the pcv system introducing it to the intake.

The Provent will allow the gases back into the intake to be burnt, just removing the oils etc to the sump - which once warm will evaporate to be consumed by the engine.

Whilst the colour of the oil in the Provent (for those of us who use a drain tube) looks "orribly" black and not what you would want to feed back into the engine, I logically would have to assume Tombie and others are technically correct. Hopefully this is the case and we don't then have to risk the drain spreading oil around the country, especially if the drain tap leaks!!!

Ongoing oil analysis confirms our oil is fine at 12k so I’m not concerned at all.

Originally Posted by Tombie

Mal I think you’re missing the point..

The PCV system returns the same back into the engine regardless... only the oil vapour is filtered and extracted to go back to the sump.

Acids are a by product of combustion, and once an engine is up to temperature it tends to burn a portion of this off vi the pcv system introducing it to the intake.

The Provent will allow the gases back into the intake to be burnt, just removing the oils etc to the sump - which once warm will evaporate to be consumed by the engine.

not missing the point at all, you will get water condensate in humid environments eg. coastal areas , in a provent or other good quality catch can, I just prefer to keep that condensate out of the oil as it tests rather acidic last test I did on some pH 2.5 , basically vinegar level.
a drain on the provent to a small screw on container works rather well.