My W204 M156 C63 smokes at high reves and chows oil, but it doesn't smoke at idle.
Thread Starter
Newbie
Joined: Jul 2020
Posts: 3
Likes: 0
W204 C63
My W204 M156 C63 smokes at high reves and chows oil, but it doesn't smoke at idle.
My W204 M156 C63 Smokes @ high reves and chows oil, but it doesn't smoke at idle, Can the oil Catch Can cause this issue? There is no sign of oil at the exhaust either to maybe think that it could be Valve Guides or seals because I have replaced the Valve Seals. There is no loss of power
MBWorld Fanatic!
Joined: Aug 2016
Posts: 2,405
Likes: 724
12 C63BS Magno Alanite Grey, 25 X5 Msport, 08 BMW E93, Ducati Hyper 698
My first thought would be a failed PCV as it will suck minimal oil at idle but much more as revs increase. If you have a catch can, then how is you setup configured with the PCV and catch can and has the catch can been on for a while or did this start when you added it - since you have a catch can do you have a supercharger also or everything else stock?
Thread Starter
Newbie
Joined: Jul 2020
Posts: 3
Likes: 0
W204 C63
My first thought would be a failed PCV as it will suck minimal oil at idle but much more as revs increase. If you have a catch can, then how is you setup configured with the PCV and catch can and has the catch can been on for a while or did this start when you added it - since you have a catch can do you have a supercharger also or everything else stock?
MBWorld Fanatic!
Joined: Aug 2016
Posts: 2,405
Likes: 724
12 C63BS Magno Alanite Grey, 25 X5 Msport, 08 BMW E93, Ducati Hyper 698
What year is it and what miles are on it and are you sure it is oil smoke, when you say white smoke, there is white smoke usually coolant, grey/blue smoke oil and black smoke unburnt fuel although can look white with black wisps. I find smell is a better judge as coolant is sweet, fuel smells like fuel and oil like oil.
Smoke at startup is pretty common on these cars from fuel in the exhaust, has happened on both of mine if say I am washing it and start it and back it out of the garage and shut it off, then wash it then start it and put it back in the garage, then the next startup hours later or the next morning will have some grey smoke from unburnt fuel in the exhaust from starting it a few times cold and shutting it off before it warms up. So may be unrelated to the oil consumption issue or could be valve stem seals, which I have not heard of a lot.
Smoke at startup is pretty common on these cars from fuel in the exhaust, has happened on both of mine if say I am washing it and start it and back it out of the garage and shut it off, then wash it then start it and put it back in the garage, then the next startup hours later or the next morning will have some grey smoke from unburnt fuel in the exhaust from starting it a few times cold and shutting it off before it warms up. So may be unrelated to the oil consumption issue or could be valve stem seals, which I have not heard of a lot.
Member
Joined: May 2017
Posts: 242
Likes: 48
From: West by god Virginia
'08 C300 4Matic Sport / '11 C63
And is it just a puff of smoke at high revs? I know from having people follow me when I WOT I pass a puff of smoke and I do use about a liter of oil every 3,000-5,000 miles depending on how hard I drive it. From what I read about normal for our engines unless I misinterpreted my readings. Anyone clarify, I know mine even after updated Velos tune I still run way freaking rich too so some smoke is from that.
Newbie
Joined: Apr 2024
Posts: 14
Likes: 0
S63 2008
Oil level goes dow fast less then 700 miles
Hi,
I hope you get some help.
I have a high mileage m156 120k
Car runs fine and it oil chows oil like it's nothing.
700 miles in car will burn more then about 2L
I filled the dip stick to the max. About 200 miles it the dip stick level already when down about 0.5L
mix city driving a high way. 70% city 30% highway.
Mix driving between hard acceleration and normal driving.
there no smoke when driving, only on cold start and car has been sitting.
I have no clue what this could be at this point.
I have a catch can and new pcv. Catch can has oil every 1000 miles, almost half full.
valve stem seals have not been touch. Bore scope looks great.
I hope you get some help.
I have a high mileage m156 120k
Car runs fine and it oil chows oil like it's nothing.
700 miles in car will burn more then about 2L
I filled the dip stick to the max. About 200 miles it the dip stick level already when down about 0.5L
mix city driving a high way. 70% city 30% highway.
Mix driving between hard acceleration and normal driving.
there no smoke when driving, only on cold start and car has been sitting.
I have no clue what this could be at this point.
I have a catch can and new pcv. Catch can has oil every 1000 miles, almost half full.
valve stem seals have not been touch. Bore scope looks great.
Trending Topics
Newbie
Joined: Apr 2026
Posts: 1
Likes: 0
Hi..i knw its long back..and im sure u must have fixed the issue, im facing the same, can u pls help the solution
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
