Oil Catch can
 

Has anybody added one?

I am thinking of adding one, as I am sick of all the oil being sucked into the intake.

I don't remember any owner ever commenting that they had done this. Where would you propose installing it?

An engine in good condition doesn't suck much, if any oil into the intake.

I have read about some losing a quart or more every 5-6k miles, to me that is a LOT of oil and never heard of one that did not use oil.

Thinking about putting it under the airbox, question is how best to place it in the breather hose. I am still working on that piece.

A quart per thousand or less is 'a lot'. A quart in 5-6 thousand is nothing. Only a small percentage goes through the the intake.

You're trying to fix something that's not broken.

I have seen on other car forums through the years that I have belonged to that folks installed catch cans. That said, a quart every 5 or 6k is not bad at all.

On the new direct injection cars, adding a catch can is a must. Without the injectors washing the oil off of the valves, mfg's didn't anticipate the level of shale build up on the valves.


They Borescoped my sister's DI GMC Acadia and the Valves looked like a mountain range after 70K miles. It ran like crap, too.

A few have added them on here although you will be hard pressed to find much information overall. It will require downsizing the breather line size going from the intake to valve cover. Anyone that has pulled the IC's off of one of these cars with any amount of miles will see the amount of oil in their is quite a bit. That oil coating reduced the IC efficiency and also increases chances of detonation. SO its a great idea. I'm eventually going to do one. As a matter of fact my latest xkr fiasco was going to also include adding one but I couldn't sort the proper adapters to make the install look halfway neat. Anyway if you do take on this challenge do us all a favor and post the info! I really wish I could remember who I saw here that installed one on an xkr . It was an RX performance can however none of the photos worked anymore. GOOD LUCK!

I just got a PM asking about that catch can so have some pictures handy.

No laughing at the bracket, this is folded up beer can painted black kind of stuff. But it works and isn't very visible.

Only the part load breather goes to the catch can, and then to the intake elbow. The full load side has zero oil in it after 70k miles so I just plumbed it the same way as stock, into the intake tube after the MAF.


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I installed one on my 98' XJR that has 235K miles on it about two weeks ago. I bought it thru Amazon and it's a see thru Jegs unit. I do see a small amount of oil in there already but, it's been idling a lot lately because I just did every gasket on that engine. I also don't have it tagged or insured yet so I haven't really driven it much either. I'll keep you informed.

Thanks Charlie I remember seeing yours as well. Did you uses a piece of smaller tube inside the larger one to adapt sizes? Also if you can how much oil have you been getting. Thanks

If you dissect the OEM fittings they are really just a hose barb. I used barb adapters there appropriate with clamps.

If I recall the check valve was 5/8 adapted to 3/8 for the can. So you have the OEM o-ring fitting, a 5/8 short hose, adapter and then 3/8 tube. Thus the 3 clamps near the valve.

It catches more than you might expect. I've never had any noticable oil consumption but at normal change intervals there will be a few ounces in the can.

In terms of fouling the supercharger and intake I think the EGR is a far bigger concern than the breather. I say that because there is little if any oil upstream of my throttle body but it completely coats the supercharger and intake downstream of the EGR.

Also I don't buy the increased detonation from oil. If it stays in suspension oil will lower the volatility, slow the burn and reduce preignition (similar to increasing octane), if it falls out of suspension it should have no effect.

The only ways I see oil causing detonation are if it fouls the MAF in open loop, fouls the O2 in closed loop or over time causes deposits in the combustion chamber which increase static compression ratio.

I'm an engineer btw so I generally don't pull information out my rear. Without getting into too much detail on the many reasons how and why oil causes detonation I'll just mention two. First the oil coating the IC fins reduces their efficiency(and if you ever pulled an IC off its generally more than just a coating. Secondly the oil does make its way into the combustion chamber causing deposits, hot spots and ultimately detonation. Direct injection engines have a huge issue with this.

Not an engineer either, but oil catch cans are taken very seriously with the supercharged Ford enthusiasts. Have installed one for each cylinder bank on my Mustang and regularly drain a few tablespoons each oil change. It keeps the intercooler clean. Not sure how it might impact the non-boosted Jags, or where is the best spot to install one, but clean intake air is never a bad idea.