Oil Leak Issue Returned - 2019 E63
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2001 S600 V12 Sold, 2011 Jaguar XFR Sold, 2017 S550 4-Matic, 2018 S63 AMG Sedan
****UPDATE****
Benz is fixed - for now lol. I asked them about the oil separators causing RMS leaks, they said they did some vaccum test and the results were within what Mercedes suggested. The stock RMS seals on these cars are made of cast iron and now they have installed an aluminium seal, which tends to hold better.
So let's hope for the best.
Benz is fixed - for now lol. I asked them about the oil separators causing RMS leaks, they said they did some vaccum test and the results were within what Mercedes suggested. The stock RMS seals on these cars are made of cast iron and now they have installed an aluminium seal, which tends to hold better.
So let's hope for the best.
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2019 E63 AMG S
Interesting...The actual RMS is made of a rubber type substance, I don't know if it's HDPE or EPDM or some other synthetic. So I'm not sure what they are referring to as being made from aluminum. The housing for the RMS is made of aluminum, but that was the case for the original and current case. I've heard they changed the sealent material, but that hasn't been a factor in RMS leaks. So not sure what you mean about something being made of os cast iron in the past, and now being made of aluminum.
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2019 E63 AMG S
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Last edited by PeterUbers; Feb 28, 2025 at 06:10 PM.
Out Of Control!!
Joined: Jun 2004
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
so you're saying they did not replace the oil vapor separators, they did not put the new part number Oil vapor separators in your car just replaced the RMS: did they use a new part number of the RMS?
Every other dealer is replacing both oil vapor separators, and the RMS, unfortunately I feel like you're gonna be back in this situation in the not too distant future because they did not do the full scope of the work.
Every other dealer is replacing both oil vapor separators, and the RMS, unfortunately I feel like you're gonna be back in this situation in the not too distant future because they did not do the full scope of the work.
Last edited by PeterUbers; Feb 28, 2025 at 06:09 PM.
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From: Midwest
2019 E63 AMG S
so you're saying they did not replace the oil vapor separators, they did not put the new part number Oil vapor separators in your car just replaced the RMS: did they use a new part number of the RMS?
Every other dealer is replacing both oil vapor separators, and the RMS, unfortunately I feel like you're gonna be back in this situation in the not too distant future because they did not do the full scope of the work.
Every other dealer is replacing both oil vapor separators, and the RMS, unfortunately I feel like you're gonna be back in this situation in the not too distant future because they did not do the full scope of the work.
Thinking of reducing my driving in Sport+ mode by 70%, maybe that will help..
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Doesnt seem like it..they just said based on the vaccum test there are no issues with the oil vapor separators. Yes, they have used a new part number of the RMS (i dont know which number).. They said they warranty their work so if the problem happens again, they will fix it for free.
Thinking of reducing my driving in Sport+ mode by 70%, maybe that will help..
Thinking of reducing my driving in Sport+ mode by 70%, maybe that will help..
here's the thing though, your RMS was leaking because of a crank case pressure problem. That is something that has been directly associated with failure of the oil vapor separators. They replaced the RMS, but they did not replace the cause of the crank case pressure problem, which is the oil vapor separator. Essentially your car has not been repaired. it's just a matter of time until this new RMS leaks again and when it does, I hope you get the warranty repair for free on the RMS and then they put their heads on correctly and do the oil vapor separators as well. I just don't think they know about the oil vapor separators and probably should've been more thorough in calling Mercedes or getting a real diagnosis.
Last edited by PeterUbers; Feb 28, 2025 at 10:00 PM.
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I think counterintuitively increasing your driving of sport mode by 70% is more appropriate, that'll keep the oil vapor separator is happier and less gummed up potentially. Therefore the recommendation is to drive your car more aggressively for a longer duration if possible.
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2002 CL500 to CL55 conversion
I think counterintuitively increasing your driving of sport mode by 70% is more appropriate, that'll keep the oil vapor separator is happier and less gummed up potentially. Therefore the recommendation is to drive your car more aggressively for a longer duration if possible.
here's the thing though, your RMS was leaking because of a crank case pressure problem. That is something that has been directly associated with failure of the oil vapor separators. They replaced the RMS, but they did not replace the cause of the crank case pressure problem, which is the oil vapor separator. Essentially your car has not been repaired. it's just a matter of time until this new RMS leaks again and when it does, I hope you get the warranty repair for free on the RMS and then they put their heads on correctly and do the oil vapor separators as well. I just don't think they know about the oil vapor separators and probably should've been more thorough in calling Mercedes or getting a real diagnosis.
here's the thing though, your RMS was leaking because of a crank case pressure problem. That is something that has been directly associated with failure of the oil vapor separators. They replaced the RMS, but they did not replace the cause of the crank case pressure problem, which is the oil vapor separator. Essentially your car has not been repaired. it's just a matter of time until this new RMS leaks again and when it does, I hope you get the warranty repair for free on the RMS and then they put their heads on correctly and do the oil vapor separators as well. I just don't think they know about the oil vapor separators and probably should've been more thorough in calling Mercedes or getting a real diagnosis.
“more thorough in calling Mercedes?” I worked with multiple techs at Mercedes who couldn’t understand why I was dropping the engine to also replace the oil separators on a m177 RMS leak… granted this was before many knew of the correlation
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AMG GT 63s
Hello everyone,
I recently performed major service on my 2019 Mercedes-AMG GT 63 S with the M177 engine, which included replacing the following components:
However, after about 200 km of spirited driving over 3 days, I noticed 3 very small drops of oil coming from the weep hole (the small drainage hole between the engine and transmission bellhousing). No oil was found on the ground — just these few spots inside the housing.
The mechanic told me that this may be residual oil trapped in an area that wasn’t opened during the repair — specifically because the oil pan (lower crankcase) was not removed. He explained that it’s normal to see a few drops like this after driving, as the leftover oil can be pushed out by heat and pressure during normal operation.
I’d really appreciate any advice or shared experiences — especially from others who have done RMS work on the M177 engine.
Thank you in advance!
I recently performed major service on my 2019 Mercedes-AMG GT 63 S with the M177 engine, which included replacing the following components:
- ✅ Rear Main Seal (RMS) – upgraded to the latest version
- ✅ PCV / Oil Separator
- ✅ Water Pump
- ✅ Thermostat
However, after about 200 km of spirited driving over 3 days, I noticed 3 very small drops of oil coming from the weep hole (the small drainage hole between the engine and transmission bellhousing). No oil was found on the ground — just these few spots inside the housing.
The mechanic told me that this may be residual oil trapped in an area that wasn’t opened during the repair — specifically because the oil pan (lower crankcase) was not removed. He explained that it’s normal to see a few drops like this after driving, as the leftover oil can be pushed out by heat and pressure during normal operation.
❗️My Concerns:
- Is this behavior normal after an RMS replacement when the oil pan wasn’t removed?
- Could it really just be old trapped oil from before the repair?
- Or does this suggest a possible leak or improper sealing?
I’d really appreciate any advice or shared experiences — especially from others who have done RMS work on the M177 engine.
Thank you in advance!
MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,254
Likes: 171
2002 CL500 to CL55 conversion
Hello everyone,
I recently performed major service on my 2019 Mercedes-AMG GT 63 S with the M177 engine, which included replacing the following components:
However, after about 200 km of spirited driving over 3 days, I noticed 3 very small drops of oil coming from the weep hole (the small drainage hole between the engine and transmission bellhousing). No oil was found on the ground — just these few spots inside the housing.
The mechanic told me that this may be residual oil trapped in an area that wasn’t opened during the repair — specifically because the oil pan (lower crankcase) was not removed. He explained that it’s normal to see a few drops like this after driving, as the leftover oil can be pushed out by heat and pressure during normal operation.
I’d really appreciate any advice or shared experiences — especially from others who have done RMS work on the M177 engine.
Thank you in advance!
I recently performed major service on my 2019 Mercedes-AMG GT 63 S with the M177 engine, which included replacing the following components:
- ✅ Rear Main Seal (RMS) – upgraded to the latest version
- ✅ PCV / Oil Separator
- ✅ Water Pump
- ✅ Thermostat
However, after about 200 km of spirited driving over 3 days, I noticed 3 very small drops of oil coming from the weep hole (the small drainage hole between the engine and transmission bellhousing). No oil was found on the ground — just these few spots inside the housing.
The mechanic told me that this may be residual oil trapped in an area that wasn’t opened during the repair — specifically because the oil pan (lower crankcase) was not removed. He explained that it’s normal to see a few drops like this after driving, as the leftover oil can be pushed out by heat and pressure during normal operation.
❗️My Concerns:
- Is this behavior normal after an RMS replacement when the oil pan wasn’t removed?
- Could it really just be old trapped oil from before the repair?
- Or does this suggest a possible leak or improper sealing?
I’d really appreciate any advice or shared experiences — especially from others who have done RMS work on the M177 engine.
Thank you in advance!
ironically worked on this same car a year later after leaving Mercedes to start my own company. And no signs of leaks from RMS when it was in for brakes
anyone needing help with this repair feel free to reach out
ctravis595@gmail.com
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AMG GT 63s
Yes had this issue after doing rms and separators. Took out transmission and found nothing leaking around rms or cover plate. Me and shop foreman agreed there was residual oil coming from somewhere else. He recommended to take out each bolt of the cover one by one and add more rtv sealant around threads of bolts as a precaution.
ironically worked on this same car a year later after leaving Mercedes to start my own company. And no signs of leaks from RMS when it was in for brakes
anyone needing help with this repair feel free to reach out
ctravis595@gmail.com
ironically worked on this same car a year later after leaving Mercedes to start my own company. And no signs of leaks from RMS when it was in for brakes
anyone needing help with this repair feel free to reach out
ctravis595@gmail.com
) so far bro
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