oil in air intake

It's called an oil catch can and even Super cheap auto sells them. They even have an external clear tube so you can see when it's time to drain it.

They do work when built correctly, but most of the one's commercially available are little more than a canister to redirect the air/oil mist. They will still work up to a point but not as well as a properly internally baffled catch can will.
They work by allowing the oil in the mist to condense and the clean air to be redirected back to the air inlet.
The ones I have been involved with in the past were all internally baffled and also had stainless steel scourers to further separate the oil.
Some people like to redirect the oil back to the sump but if you've seen what comes out of the catch can that's the last thing you want back in you oiling system.
If you do buy one of the commercial ones make sure that the fittings are at least the same size as the hose fittings currently on your rocker cover and air inlet. If you don't, you can pressurise the engine which will cause you problems elsewhere.
Regards Andrew.

You might be interested in this:

Site Link

"Oil catch cans will cause problems for a diesel engines if fitted.
http://cgi.ebay.com.au/Oil-Catch-Can-intercooler-turbo-exhaust-nissan-subaru_W0QQitemZ4599049761QQcategoryZ32624QQrdZ1QQcmdZViewItem

About 300km ago I fitted one to my Turbo diesel Nissan Terrano, thought it was a good idea and nobody told me it wasn't.
Basically all oil catch cans have small 1/4 inch piping, which is totally inadequate to handle the larger volume of blow-by air that a diesel engine produces. (Due to the higher compressions).
Due to the restrictions that the small dia piping has, I was effectively pressurising, tapot cover, sump, all oil lines, turbo etc...
So only after 300km, my turbo let go, the oil seals busted out and dumped huge amounts of oil into the inlet side of the turbo. The turbo is currently being rebuilt by the blokes at MTQ in Rockhampton.

As soon as they opened the bonnet they knew what had caused the turbo to fail. They specailise in turbo diesel engines and the like. There solution to the problem is that they use common old 1" line strainers, (The same things you can find at any local pumping and irrigation business)
www.monarchindustrial.com.au/inline.html

So inclosing, if you have bought and fitted one to your diesel, rip it out.
P.S. if anyone thinks I am wrong, in any of this, by all means post something.

Thanks
SantaAus"

I have made up an oil catch can myself out of plumbing pvc and hose fittings etc..

I have to admit it took me a couple of goes to get it to the point where I am happy.. however now that I have it all under control I am very happy with the result..

I have put a bolt and threaded nut on the bottom of it all to drain the oil out and every now and then I just unscrew it and let the oil run out... normally only about 50ml or so.

The main reason I put it together was that after a long drive when I took off in the morning the motor would leave a big plume of smoke behind me until it burnt off the oil that had been layered onto the walls of the tubing etc and was leaking down the pipes overnight!

I was told by a few people that this is a very bad practice to use a catch can as if it is left to fill up and the car goes up on an angle etc it could potentially dump a heap of oil in the turbo in one hit.... I really don't think that is an issue though for someone that maintains their motor regularly....

Cheers

I have been told that if you're turbos leaking oil that you're seals gone in it and needs rebuilding?

I think i'm talking about the exhaust side sorry