Is it normal to smell oil with downpipes?
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Super Member
Joined: Mar 2008
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From: Chicago
15 S63, 18 Ram 2500 Cummins
Is it normal to smell oil with downpipes?
I know its normal to smell gas if you have DP's with NO CATS, but I smell oil, Not always though. No leaks at all and the oil is only smelled outside. like the side of the vehicle where the DP would be. Is this normal? Its def. oil even my friends confirmed, like I said, its NOT a constant smell. Comes and goes.
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From: miami / delray beach
2014 E63s amg 4matic, 2009 C63, 2006 E55 AMG , 2001.5 AUDI S4 stg 3+ w/meth
100% normal.... no cats to burn unburned gas exiting the engine into the exhaust, so you're gonna smell gas.... its not near as bad on turbo cars since exhaust passes through turbo housing before heading back to downpipes
on my C63 and E55 with longtube headers/no cats the smell was way worse, like would get you high/noxious if you stood outside of those cars for more than 15 seconds lol
on my C63 and E55 with longtube headers/no cats the smell was way worse, like would get you high/noxious if you stood outside of those cars for more than 15 seconds lol
Thread Starter
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From: Chicago
15 S63, 18 Ram 2500 Cummins
im not worried about the gas smell, it smells like oil sometimes
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2013 E550, 2014 GLK 350
In short, no, it is not. Not at least from my experience. It's probable you have a VERY slow leak that is never making it to the ground and burning off when it hits the exhaust. Over time, as it gets worse, you will see the signs of it.
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From: miami / delray beach
2014 E63s amg 4matic, 2009 C63, 2006 E55 AMG , 2001.5 AUDI S4 stg 3+ w/meth
running a full catless set-up it will smell like burning fuel/oil since its straight combustion gasses escaping the motor.
also if dps are recently installed (like less than 100 miles on them) they will burn off some stuff as most people don't wipe down the pipes after install but they should as hands get greasy and sometimes there is an oily residue on exhaust components from the manufacturing process.
or sign of turbos seals going,,,,going catless shows the symptoms more.
also if dps are recently installed (like less than 100 miles on them) they will burn off some stuff as most people don't wipe down the pipes after install but they should as hands get greasy and sometimes there is an oily residue on exhaust components from the manufacturing process.
or sign of turbos seals going,,,,going catless shows the symptoms more.
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E63
Just smells funny overall. different smell, kinda pungent smell that is different than my past catless cars. I won't really say oil smell just slightly different than just gas smell.
That being said, your eyes do not water standing outside this car either like past cars. Its not a pleasant smell but its not so strong either
That being said, your eyes do not water standing outside this car either like past cars. Its not a pleasant smell but its not so strong either
Thread Starter
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From: Chicago
15 S63, 18 Ram 2500 Cummins
When do turbo seals usually go? I feel like I highly doubt its turbo seals, worse case small seepage from valve cover gaskets and they're burning down on exhaust manifolds or DP
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From: miami / delray beach
2014 E63s amg 4matic, 2009 C63, 2006 E55 AMG , 2001.5 AUDI S4 stg 3+ w/meth
it can be any time frame.... ive had it happen after 5K miles on a new turbo that i was running heavy boost on while, unbeknownst to me i had a blocked crankcase vent...you can develop a turbo seal leak due to excessive inlet pressure, excessive crankcase pressure, or an otherwise restricted drain...Turbos seals are journal bearings which are very simple and like all bearings, prone to failure from time to time. If you have dirty oil or very high temperature the beairngs will wear to the point that they won't seal well
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From: Toronto
1994 E500, 2012 e63
Mine stinks pretty bad too, was worse for the first week after the cats came out. My car is white so the bumper also gets a film on it over top of the exhaust tips if I don't wash it for a week or so. I smell fuel but no oil.
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From: Toronto
1994 E500, 2012 e63
MBWorld Fanatic!
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From: miami / delray beach
2014 E63s amg 4matic, 2009 C63, 2006 E55 AMG , 2001.5 AUDI S4 stg 3+ w/meth
blue smoke will be intensive especially when boosting...and dropping the downpipe normally solves this mystery since there will be signs of major oil burning there.. Check for in and out and side to side play of the turbine wheels ..shaft play pretty much seals the deal in diagnosis of bad seals
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From: Chicago
15 S63, 18 Ram 2500 Cummins
yea, but turbo seals will be a constant oil smell. I took it to a performance MB shop and it seems like its just swoosh of oil smell right at startup, but no smoke from exhaust or anything, just a smell for a brief few seconds right by the door
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E63
So this car does not have a PCV valve (according to service advisor and parts guy), but it does have two pseudo PCV like parts that leak and cause oil smells
278 010 0431 - Oil separator
000 998 6590 - Plug
Both located in the rear of the engine and act like PCV valves (may be exactly that but since they do not have that official name from MB, the dealer guys refuse to call it PCV). But they do tend to leak
278 010 0431 - Oil separator
000 998 6590 - Plug
Both located in the rear of the engine and act like PCV valves (may be exactly that but since they do not have that official name from MB, the dealer guys refuse to call it PCV). But they do tend to leak
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From: Houston, TX
Mercedes-Benz AMG E63 & ML350 Bluetec
You would think a guy with a Cummings diesel would be used to smelling oil and seeing smoke. 
I have barely smelled anything in my car since getting the DP's, but I did remove the cats, so just a bit of smell of exhaust if I leave it running after I get home and immediately get out of the car.
Good luck with it and keep us apprised.
I have barely smelled anything in my car since getting the DP's, but I did remove the cats, so just a bit of smell of exhaust if I leave it running after I get home and immediately get out of the car.
Good luck with it and keep us apprised.
Thread Starter
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Joined: Mar 2008
Posts: 546
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From: Chicago
15 S63, 18 Ram 2500 Cummins
You would think a guy with a Cummings diesel would be used to smelling oil and seeing smoke.
I have barely smelled anything in my car since getting the DP's, but I did remove the cats, so just a bit of smell of exhaust if I leave it running after I get home and immediately get out of the car.
Good luck with it and keep us apprised.
I have barely smelled anything in my car since getting the DP's, but I did remove the cats, so just a bit of smell of exhaust if I leave it running after I get home and immediately get out of the car.
Good luck with it and keep us apprised.
