C63 AMG (W204) 2008 - 2015

Weistec M156/M159 Oil / Air Separator

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Old 12-27-2011, 03:25 PM
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Originally Posted by bluejae
so what exactly are you supposed to do after this is installed?

it kind of looks like the bottom part screws off... is that where the oil goes? and you empty it out and screw it back in?

is this done every oil change?

and someone suggested spraying something and cleaning the intake during the first install... is this recommended by weistec?
After install it is recommended you check the separator every 2K to 3K miles. The bottom part does screw off for an easy inspection.

The instructions show nothing about cleaning the intake except wiping the connections with a clean shop towel prior to install but I guess it can't hurt.
Eventually the intake will clean up on its own as oil will be diverted to the separator.
Old 12-27-2011, 03:35 PM
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Originally Posted by bluejae
so what exactly are you supposed to do after this is installed?

it kind of looks like the bottom part screws off... is that where the oil goes? and you empty it out and screw it back in?

is this done every oil change?

and someone suggested spraying something and cleaning the intake during the first install... is this recommended by weistec?
Top section separates the oil from the air and it drips down to the collector on the bottom. Check/empty the bottom section with oil change.
Old 12-28-2011, 03:13 PM
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Originally Posted by dacls63amg
Can you guys also PM me the instructions?

Thanks!
Please shoot us an email at info@weistec.com and we will be happy to email you a copy. Thank you!

Weistec Engineering
Old 12-28-2011, 03:18 PM
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Originally Posted by bluejae
so what exactly are you supposed to do after this is installed?

it kind of looks like the bottom part screws off... is that where the oil goes? and you empty it out and screw it back in?

is this done every oil change?

and someone suggested spraying something and cleaning the intake during the first install... is this recommended by weistec?
As some of the others stated, it is not necessary to spray or clean in internals of the intake manifold to install this piece.

If you haven't already, please visit our website for more information on the Oil/Air Separator system.

http://weistec.com/m156os.html

Thank you very much!

Weistec Engineering
Old 12-28-2011, 06:50 PM
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what's the estimated DIY install time on this?
Old 12-31-2011, 07:55 PM
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Well, for a C63 its not quite as straight forward as previously thought but not that tough. You will need to fabricate your own installation bracket.

You CANNOT install the unit where the instructions tell you on a C63 because we have a dip stick there.
Weistec M156/M159 Oil / Air Separator-b0fa0435.jpg


Remove all the intake stuff:
Weistec M156/M159 Oil / Air Separator-7fc92465.jpg

Then cover up the rear intake opening with some painters tape or rag.
Weistec M156/M159 Oil / Air Separator-e8c6f4e7.jpg

Then remove the single T30 torx screw and pull out the stock PCV valve:
Weistec M156/M159 Oil / Air Separator-5bbfd533.jpg

After wiping out the openings and cleaning the O-rings put some fresh oil on them and intall the new parts. Don't drop anything like I did and drive yourself crazy for an hour trying to find that little "C" shaped clip that holds the new fitting into the intake manifold.
Weistec M156/M159 Oil / Air Separator-6cc74383.jpg
I did install a piece of hose around the dip stick because the new aluminum brackets were rubbing the dip stick.

Then I fabricated a bracket out of 2" flat aluminum bar, and NO its not an edger blade and yes its ugly but I'll redo it another day. I installed mine on two existing bolts that had 10MM bolts in it. Just replace the two bolts with longer ones.
Weistec M156/M159 Oil / Air Separator-ea2a95cd.jpg
Weistec M156/M159 Oil / Air Separator-ee1bf887.jpg
Weistec M156/M159 Oil / Air Separator-e061c495.jpg

Then install the new separator:
Be sure to put a piece of the bracket supplied to keep the separator off the bracket so it will spin to remove the accumulator.
Weistec M156/M159 Oil / Air Separator-bc915d4c.jpg
Weistec M156/M159 Oil / Air Separator-12fae1a0.jpg

Then put it all back together:
Weistec M156/M159 Oil / Air Separator-38ea1ebc.jpg
Weistec M156/M159 Oil / Air Separator-d5440909.jpg
Weistec M156/M159 Oil / Air Separator-839372f2.jpg

Good luck but allow yourself a couple of hours to make the bracket.

Last edited by Dads C63; 12-31-2011 at 08:19 PM.
Old 01-20-2012, 03:19 PM
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I have one installed on my CLS 63 and I think this is a great mod to have. I've driven with the oil/air separator for about 2k miles and it has caught a good amount of oil. I'll post up pics here soon. After the install, I have noticed that the car sounds a lot more healthy. Response is a lot more responsive and crisp. I have certainly noticed less ticking/pinging from the motor.

As for the install on the CLS 63, it does not fit on the passenger side of the car due to the ecu cables being in the way. I had to re route it all to the driver side behind the motor.
Old 02-02-2012, 09:50 AM
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was longer hose used in order to reach the new location? If so how much longer,Thank you.
Old 02-02-2012, 11:21 AM
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I bought an extra 6' and it worked fine. Good luck!
Old 07-24-2012, 06:24 PM
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Did this product ever get updated to be more of a drop in into the C63?

Ill pay 500 as long as I can actually drop it in without fabricating additional parts.
Old 07-24-2012, 07:14 PM
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Originally Posted by flomofo
Did this product ever get updated to be more of a drop in into the C63?

Ill pay 500 as long as I can actually drop it in without fabricating additional parts.
You can install as per the original instructions, just that you will need to lift the oil separator out of the way to check the dipstick.
Old 07-24-2012, 08:53 PM
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How on earth are you getting your hand under the product to unscrew that knurled portion?

also, excuse my ignorance but what it be a good/bad idea to seafoam the car before installing one of these? i don't know much about the product and the idea of it scares me but i've heard it's actually a great product.

















Originally Posted by schmick325
Have done approx 1000 kms (620 miles) with the separator installed and this is what it's collected so far:





Glad I've got it!
Old 07-24-2012, 09:40 PM
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Originally Posted by flomofo
Did this product ever get updated to be more of a drop in into the C63?

Ill pay 500 as long as I can actually drop it in without fabricating additional parts.
Yes. Has been relocated to the front. All parts included.
Old 07-25-2012, 11:27 AM
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No seafoam!

Just let the motor clean itself out, dont use that stuff on a new car with a motor that costs that much, not neccesary.
Old 09-22-2015, 12:06 PM
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Now this peaks my curiousity. Incredible that this thing helps the motor so much. Now I just need to get the funds together to purchase one and install it.


Whats the average time for install? 1-2hours?

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