Johnnie58

Emissions emissions emissions

roadtalontsi

So those are pictures of the intake ports on the cylinder head, not the intake manifold itself. I've pulled plenty off that have no problem dripping a good 1/2qt regardless of mileage just laying there. Disassemble the intake manifold and you'll see the real story. Combine that with the fact that those plastic bushings for the intake runner length flaps dont like oil - and over time you're looking at plastic bits and chunks getting sucked in to your combustion chamber. Say what you will and you're entitled to your opinions. I've also had a handful of sls intakes apart and it there were literal pools of oil laying inside.

Is a catch can a must? well no thats why benz didnt put it there. oil entering the intake will likely get burned and thats all. Keep in mind the average car owner only owns a car 2-3yrs tops. Will this cause issues in that time frame no, benz would've resolved that. Will it cause issues eventually 10yrs later possibly. Much like the "deaded headbolts" . Do you need upgraded ones, no not really unless they are causing a problem. Could it be potentially catastrophic as time and mileage add up? sure. A new cylinder head runs around 4-5k$ in parts alone, a damage valve seat and valve is not a cheap repair. If you are a short term owner dont bother it wont be your problem, if you are a lifer and this car is more than a few year fling than i'd recommend one.

sventastic82

I took the the intake manifold apart including the throttle bodies. There where slightly coated in oil. The belly pan had no standing oil in it. Unfortunately I didn't take any pictures of that.

The plastic bushings are made of PA which is polyamide also known as nylon which is oil resistant.
Not sure why the wouldn't like oil if they are resistant to it.

the average new vehicle ownership is well over 4years. Especially with the new and longer car loan terms of 60 or ever 72month.

Besides the fact that my car has 95k mile on it which is what 90% of c63 haven't reached yet. So therefor the build up was little and not worth cleaning it or installing a catch can. And that is what it is.
Maybe my car is just the exception.

Phil Chow

Had mine done last week. Pooled oil dumped out of the Intake Manifold, quite a lot.

I'm happy I got it done, I plan on keeping the car for a bit longer, so it was worth it. Cleaned everything up, and also installed an AOS.

I come from 2.0T VW Engines, so I know how useful a Catch Can is to catch blow-by.

Jon2007E63P30

Same experience

604 C63

I don't have anything to say. I just wanted to see the motor **** again

ZephyrAMG

Drove the car all weekend and kept thinking, man what an engine!

betrezra

I've always used a catch can with addition of an aftermarket s/c....or IF smaller pulley on a tired old blown oe motor.

I have never thought about adding one to a stock n/a motor..... particulary one with <50K miles.

Seems like a waste of money, time, and an extra step for maintenance.... and what if you forget to empty it..... and then get a real gulp of oil in the intake from the reservoir you have now added if it is full? Ever cleaned out a stinky messy catch can? PITA....

Also what is the proposed downside to allowing the pcv system to act as it was designed? to burn off any crank case gases.... which may contain oil mist/residue? It's been like this since the 70's.......

I think there is some creative yet effective marketing going on with these cans.

Jasonoff

Mixing oil into the combustion process is not good for the motor.

This is my Weistec can about 1 month (1k km) of beating the **** out of it ~20mL

BLKROKT

Misting oil reduces effective octane

604 C63

Damn. In the course of this thread I have been on the Weistec site with my finger on the buy button, then closed that window thinking I don't need it, and back again about 4 times! Half of me says if it was vital MB would put it there, then the other half of me knows decisions like that are sometimes made by way of cost and optics considerations, and still the third half of me lol hears guys who's knowledge I respect advocating for it.

Right now Im thinking its better to have it and not need it, than need it and not have it.

sventastic82

That seems to be way too much for just little over 600miles.
I would say something must be wrong.

My car only looses 200ml for every 10k miles and that is not going through the intake.
What oil are you using?

Jasonoff

Helps cause carbon build up on top of the piston heads. Carbon around the intake valves etc...
It's not vital.

Jasonoff

It's consistent with a few other C63s I know.

How do you measure your oil loss? If it's not going through the intake, does that mean you have a can and it's bone dry?

M1 0W40 Euro

sventastic82

I measure it by how much I drain vs how much I have put in on oil changes.
It has dropped from about 500ml to 200ml just by switching from M1 0w40 to LM 5w40.

No I don't have a catch can and what I'm trying to point out is not all the oil you loose is going through the intake.
Some goes over the piston rings and some over the valve guides.

Jasonoff

This helps solidify Diablos' comment about most of the consumption happening during cold start. 0W40 > 5W40.

So you pull your IM every oil change and it's dry as a bone? If you don't, how do you know it's not all consumed through the PCV?

I concur, but it's where most of it goes in my personal experience. I don't track my car so it doesn't see prolonged periods of high rpm and heat.

http://www.machinerylubrication.com/...es-consume-oil

sventastic82

No I don't pull it every oil change. I pulled it the first time at 95k miles and it was slightly coated in oil.
Even if most of it gets consumed by the PCV it not even close to that compared to the 20ml for only 600miles you catch in your can.

That is almost 3x as much as My car looses overall including piston rings, valves ect.

betrezra

Just because your catch can has oil does not nec mean your air charge is oil mist free, I doubt that little can is separating 100% of the oil vapor...... It's a feel good item w/o a blower or turbo.

If you feel it works then use it. I see no need.

Jasonoff

Keep in mind that ~20mL is not pure oil either. That's a 100mL container but it's also tapered, maybe it's 15mL but you get the gist.

The outlet hose going into the IM was dry last time I checked.

I don't "feel" it works. Just tangible evidence.

Michael Man

Hey guys, I'm new here but I have done lots of DIY on my ride.
But im not quite following where exactly is this "Catch Can" is?

I'm assuming i need to take out my intake manifold? If so, do i need to get a pair of gaskets before i do so?

Please advise, cheers guys!

604 C63

Catch can is not a factory item. Its an add on piece available from Weistec:


http://weistec.com/all/c/c-63/2008-2...-system-c.html

Jasonoff

For all the catch can haters...

Outlet:


Inlet:

oggie

I hate cleaning the intake manifold. That's good enough reason for me.

dave2001auto

Oil leaked through the turbo into the exhaust and intercooler, this seems to be a recipe for oil sludging and a clogged exhaust. And painless fixes while swapping out the turbo?

chrisridebike8

What are you talking about. The C63 doesn't have a turbo. It's all natural, baby!