I know they do this alot on the LS1's. But I've gotten mixed answers. Do you put an inline filter to catch oil in the PCV line or on the return line on the passenger side valve cover line. I'm thinking of doing both. I have oil in the hose from the passenger side valve cover hose to the TB.

 

With a healthy engine, you shouldn't need a filter anywhere in the PCV system. The filtered and metered air flows from the TB to the passenger side valve cover, through the lifter valley and crankcase, and is pulled out through the PCV valve into the intake manifold.

If you are getting oil in the line from the TB to the passenger side valve cover, it could be caused by a plugged PCV valve, or by excessive blowby on the rings.

I'd fix the source of the problem, not add a filter to the system.

The LT1 does not have the same problems as the early LS1's with regard to the PCV system.

 

Although I agree that it is not a big a prob with the Lt-1's, I don't think it would hurt anything either. If you want just get Deutsch part BF-412 to replace the tube on the passenger side valve cover. On my car I did this at around the 50,000 mile mark. Their was oil in the line at that time but not an excessive amount. I did this to try to prevent having to clean the TB out ever again. My engine is perfectly healthy but now at 65,000 miles the hose has stayed clean inside. I'm also running an air/oil seperator on the pcv valve side of it but that's another topic.

 

I've gotten quite a few emails about this so I though I would post a more lengthy reply for anyone thinking about doing this.

This is a breather filter. It replaces the plastic elbow that is in the back of the passenger side valve cover. This helps to keep oil out of the line that runs back to the throttle body. Deutsch BF-412 is an AutoZone part number. If their isn't an AutoZone local to you then you should be able to get someone to cross the part number to something different. Part should be less than 3 dollars if I remember correctly. As for an actual oil/air seperator, I am using a GReddy universal oil catch can. http://www.greddy.com/products/accessories_frame.htm . Click on oil catch cans. I'm not sure who I bought from but http://www.rxecret7.com/12003506-10.html is one of many import parts people that have it. It's certainly not a cheap part but it works so good I think it was worth every penny. It's amazes me not only how much oil it catches but water too! I simply have it hooked up to my car by interrupting the line that runs from the PCV valve that is in the drivers side intake. Now the PCV line runs directly into the catch can and then back to the original line. Hope this helps.

Edit: Let me add,
It's kind of hard to measure in the car but I the best I could just measure it's 7x2.5x3 without the fittings. With the fittings it's probably 9 or 10 inches. I just added a pic on my website. http://www.cardomain.com/member_page...page_id=336815 That's in the well, right behind and below the drivers side headlight. I made the mounting out of some plastic I had laying around my work. You could also just use the bracket it comes with. It's easily bendable.

 

Let me add that I totally agree with this statement. The filter sytem is just a preventive measure. I'm the original owner of my car. My motor is perfectly healthy at around 67,000 miles and if I can help it, it still will be healthy at 100,000. I've never thought it was a good idea to burn oil vapor, no matter how small an amount it may be, in my motors. It doesn't make good sense if your goal is engine longevity. It doesn't even make good sense for emissions. The only downside of the GReddy catch can is that you have to pull it off the car occasionally to dump the accumalated oil/water. I've only had to do it once so far and it was mostly water removed from the air. I was a little skeptical of this part when I bought it but I figured I didn't have anything to lose. The way I looked at it, either:
1. It would work and if it did it was certainly worth the money.
2. It wouldn't work. Then I could sell it easily on eBay easily since it's still a pretty "ricer" part. (No offense to any ricers here.)