Hello fellow CL members, I recently picked up a clean (according to Autocheck and Carfax) a 2012 IS250 AWD with 28K miles and being direct injection, I want to prevent the carbon build up issue by installing an oil catch can from the PCV valve.
But, theres another port on the passenger side valve cover that goes to the intake tube or inlet that collects the fumes coming from it as well.
Should I install an oil/water separator there? otherwise I fell the oil catch can is doing only half the job.
Thoughts?

 

You don't need one on the fresh air inlet. I'd be more concerned on the PCV side.

This is how a PCV system works. The link below already highlights the function.

https://dennisroadautomotive.com/new...0the%20intake.

 

Thank you Mike

 

Ok so I finally decided to put one on my car after 6 years of ownership. It's the same as the one in the link here:

The bad thing is I think your screen shot is from a YouTube video? What I would suggest is changing the lines for some reinforced fuel rated lines.

As you can see in the picture the hose is so flimsy. It's pretty much closed in on itself. Once the vaccum is pulling. Those hose's ain't never going to open up for flow. The crank case pressure will be through the roof.