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      02-14-2016, 01:40 AM   #1
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BMS oil catch can?

Hi guys, is anyone here using this oil catch can? Is it really helpful? Dont really understand the mechanism here! Can someone please educate me here? whats good about it and whats down side of using it? Thanks you very much!
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      02-14-2016, 09:13 AM   #2
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Got one coming.
I run Mann Hummell units in my diesels - stops the intake filling up with oil from crankcase vapour condensing in the intake. But they are a bit agricultural.
Hopefully the BMS unit will do similarly, without the agricultural appearance.
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      02-14-2016, 09:20 AM   #3
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Interested in how much the BMS can actually catches on the S55 -- according to BMW's technical docs, the engine has a few features to reduce/eliminate blow by...
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      02-14-2016, 09:39 AM   #4
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Quote:
Originally Posted by teefive
Interested in how much the BMS can actually catches on the S55 -- according to BMW's technical docs, the engine has a few features to reduce/eliminate blow by...
Stock motor it'll catch minimal (if any). It's when a car is tuned that there a higher chance of blow by.

Terry had said during development that if there was a case for an occ for the s55, they'd make it. And they found reason to, so Bms now sells one. Probably ask terry how much a tuned motor occ catches
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      02-15-2016, 10:29 AM   #5
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Quote:
Originally Posted by MThree_driver View Post
Stock motor it'll catch minimal (if any). It's when a car is tuned that there a higher chance of blow by.

Terry had said during development that if there was a case for an occ for the s55, they'd make it. And they found reason to, so Bms now sells one. Probably ask terry how much a tuned motor occ catches
+1

Also how you drive has an affect. If you push the car then you will probably catch more oil if you just drive around town.

Mike
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      02-15-2016, 11:08 AM   #6
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From my N54 days, I remember talk of BMW voiding your warranty if a catch can is installed. Before adding one you may want to research that.
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      02-15-2016, 11:10 AM   #7
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Quote:
Originally Posted by Ian1973 View Post
From my N54 days, I remember talk of BMW voiding your warranty if a catch can is installed. Before adding one you may want to research that.
Huh, I wonder why
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      02-15-2016, 12:25 PM   #8
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Quote:
Originally Posted by Ian1973
From my N54 days, I remember talk of BMW voiding your warranty if a catch can is installed. Before adding one you may want to research that.
Nope, no voided warranties here. We have seen a lot of cars with occ through my dealership.

Unless the occ is directly related to a failure (can't think of many it would cause) it won't be voided.
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      02-15-2016, 12:57 PM   #9
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Cant recall a single time where the OCC voided the warranty

As mentioned before, it all depends on how much boost the car is making and mostly on your driving habits
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      02-15-2016, 03:27 PM   #10
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Quote:
Originally Posted by Ian1973 View Post
From my N54 days, I remember talk of BMW voiding your warranty if a catch can is installed. Before adding one you may want to research that.

I've never heard of that? You have a link to that post.

Mike
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      02-15-2016, 03:32 PM   #11
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How much boost is required to have these as "necessary"?

I currently have jb4 stage 2
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      02-15-2016, 08:02 PM   #12
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So base on your guys thoughts, I don't think I need one lol. It is my daily and maybe only once awhile I push the car for some fun.
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      02-16-2016, 06:48 PM   #13
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Quote:
Originally Posted by F80 M Freak View Post
So base on your guys thoughts, I don't think I need one lol. It is my daily and maybe only once awhile I push the car for some fun.
If you want to keep oil out of your intercooler, charge pipe plumbing and to limit the amount of build up on your intake valves, that is primarily what's for.

Your stock system reciruclates that oil vapor back into the engine for emissions purposes. The OCC separates that blow by oil vaper so you keep your system clean. Over time that oil vapor can build up and you can lose power.

If that's not a concern, then it may not be worth it to you. Eventually that oil build it can potentially rob power but it's going to take a lot of mileage and you really won't notice your losing power since it will happen very slowly for 10's of thousands of miles.
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      02-16-2016, 06:51 PM   #14
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by F80 M Freak View Post
So base on your guys thoughts, I don't think I need one lol. It is my daily and maybe only once awhile I push the car for some fun.
If you want to keep oil out of your intercooler, charge pipe plumbing and to limit the amount of build up on your intake valves, that is primarily what's for.

Your stock system reciruclates that oil vapor back into the engine for emissions purposes. The OCC separates that blow by oil vaper so you keep your system clean. Over time that oil vapor can build up and you can lose power.

If that's not a concern, then it may not be worth it to you. Eventually that oil build it can potentially rob power but it's going to take a lot of mileage and you really won't notice your losing power since it will happen very slowly for 10's of thousands of miles.
Thanks for the detailed information! I will keep that in mind.
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      02-16-2016, 07:07 PM   #15
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Quote:
Originally Posted by ///M1990 View Post
How much boost is required to have these as "necessary"?

I currently have jb4 stage 2
According to BMS they suggest it for larger than OEM turbos or OEM turbos running more than 25psi+ on a routine basis. That said the product is largely eye-candy and preventative in nature rather as the OEM PCV system works pretty well. The OCC like all that BMS offers retains fully closed operation so while its not CARB approved yet does not impact emissions.

Mike
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      02-17-2016, 12:56 PM   #16
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
I've never heard of that? You have a link to that post.

Mike
I wish I did, but that was years ago on a different forum. I can't even remember which one where there was a large discussion on it and installing them on 335i's.

I thought it was odd to be honest, since this helps the engine, and even potentially saves BMW money if you need the valves/intake walnut blasted under warranty.
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      05-16-2019, 10:08 PM   #17
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If you needed any reason to install one. Stock car other than the catch can, catless midpipe, and red start/stop button (for 5 hp). No tune. Went in at around 3000 miles and emptying for the first time at 9700. There's about 2" of muck in there. Glad it's not in my engine.
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      05-17-2019, 08:22 AM   #18
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Quote:
Originally Posted by mrfox View Post
If you needed any reason to install one. Stock car other than the catch can, catless midpipe, and red start/stop button (for 5 hp). No tune. Went in at around 3000 miles and emptying for the first time at 9700. There's about 2" of muck in there. Glad it's not in my engine.
Eww, yup I'm getting one.
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      05-17-2019, 09:04 AM   #19
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This is what I found in mine when I cleaned it out
I think it's worth it
There was some thick sludge on the bottom and the rest was a mix of water and oil
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      05-17-2019, 11:28 AM   #20
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As the cars get older and blow by increases due to normal wear you're going to see a lot more benefit too.
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      05-17-2019, 12:04 PM   #21
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      05-17-2019, 12:15 PM   #22
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OCC is a must especially if you are doing a lot of short trips under 10 miles daily. Have a new 2018 M3 and my OCC pulls a lot of water into the catch can and a tad bit of oil. I do a lot of short drives. IMO OCC is a must. I have pics posted on a different thread
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