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GTR Pro Trasmission Fluid Leak

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Old 05-28-2023, 02:37 PM
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GTR Pro Trasmission Fluid Leak

I noticed a small spot of oil on an under-panel and, upon investigation, found a leak. I've cleaned it up as well as I could without removing the under-panel and am currently waiting to see drip level on a piece of inserted cardboard. No additional "hanging drop" has formed while the vehicle has been on the hoist overnight.

QUESTION: I have an upcoming track day that's a 4.5 hour drive away, so it'd be a serious towing bill to return the car to my dealer (don't yet know whether dealer can investigate before track day). Any ideas on this issue and whether it's likely to be a disaster if I don't cancel the track day?

Alerting leak evidence ... not there when doing May 11th pre-trackday check-over ... this is now 2 track-days later:


Here's what I found after removing the bottom of the diffuser:

Last edited by user33; 05-28-2023 at 04:43 PM.
Old 05-28-2023, 02:45 PM
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Nice catch!
Without knowing what's what until you/technician actually get in there to investigate source of leak, I myself would err on the side of caution and postpone track day until this is sorted.

A replacement, re-manufactured trans is a nightmare with prolonged downtime. From what I understand, the Dealerships don't even service the Trans themselves, and order full unit replacement.
If possible, get yourself to an Independent who works on other makes such as Ferrari, etc that also share same Trans.

Good Luck!
Let us know what you find
Old 05-28-2023, 04:50 PM
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Originally Posted by MBNRG
... A replacement, re-manufactured trans is a nightmare with prolonged downtime. From what I understand, the Dealerships don't even service the Trans themselves, and order full unit replacement. ...
Yes, I've read the various postings regarding this type of thing. As always, this forum is "great." I'm also lucky to have found a dealership that has an extremely good service department who has supported me well over the past 7 years.

AFAIK, this car is still under warranty (I've asked for confirmation on this). Still, losing a track season would be extremely disappointing ... but then, when these are the things we have to worry about, we are truly privileged.
Old 05-28-2023, 07:19 PM
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
Originally Posted by user33
Yes, I've read the various postings regarding this type of thing. As always, this forum is "great." I'm also lucky to have found a dealership that has an extremely good service department who has supported me well over the past 7 years.

AFAIK, this car is still under warranty (I've asked for confirmation on this). Still, losing a track season would be extremely disappointing ... but then, when these are the things we have to worry about, we are truly privileged.
I wonder if this have to do with it? https://mbworld.org/forums/coupe-roa...ranty-now.html
Old 05-28-2023, 07:42 PM
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Sorry to see this, I think it's better to be on the safe side to have it check out before the track day if you could, otherwise, I wouldn't risk it for the track, the leak could get much more severe once it reaches a threshold point and could result in further damage.

Hope it's just a gasket or something went wrong..
Old 05-29-2023, 01:04 PM
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Originally Posted by W205C43PFL
I wonder if this have to do with it? https://mbworld.org/forums/coupe-roa...ranty-now.html
My understanding is that that's for early GTS models (all GTR Pros are model-year 2020, though mine was manufactured in 2019).
Old 05-30-2023, 09:17 AM
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
Originally Posted by user33
My understanding is that that's for early GTS models (all GTR Pros are model-year 2020, though mine was manufactured in 2019).
I see, you are right I should had confirmed before linking it here. I am curious the changes were made by AMG however to resolve the issue which means your vehicle is not affected by that flaw?
Old 06-05-2023, 12:23 PM
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Resolution (GTR Pro Trans Fluid Leak)

My service manager agreed to have a quick look at the situation. Given the timing, I had also decided to remove the carbon fiber under-panel so I could have a proper look and found the following (this was after I'd wiped the trans/panel down with the under-panel still on):


Since the dirt on the windward side of the drain plug implied that the drain plug was seeping, I re-torqued it and it turned a couple of degrees. On the 1.5 hr trip to/from the dealer there was no more leak and it's remained that way with the under-panel reinstalled (whew!). The shop foreman agreed that everything looked good, including the seals, etc. so this was about the best "I have a trans leak" outcome one could hope for.
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Old 06-05-2023, 03:59 PM
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
Originally Posted by user33
My service manager agreed to have a quick look at the situation. Given the timing, I had also decided to remove the carbon fiber under-panel so I could have a proper look and found the following (this was after I'd wiped the trans/panel down with the under-panel still on):
https://cimg2.ibsrv.net/gimg/www.mbw...0deb2f58f6.jpg

Since the dirt on the windward side of the drain plug implied that the drain plug was seeping, I re-torqued it and it turned a couple of degrees. On the 1.5 hr trip to/from the dealer there was no more leak and it's remained that way with the under-panel reinstalled (whew!). The shop foreman agreed that everything looked good, including the seals, etc. so this was about the best "I have a trans leak" outcome one could hope for.
That is a happy ending, good job!

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