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I bought a used 2019 GlC 63 AMG (28000 mi), I have found some oil leak spots as the pictures below but I am not sure where it comes from or when it happened.
Some yellowish spots look old, and other wet (Black) spots seem the oil leak is ongoing.
Is there anyone has the similar issues or anyone know this is common issue on X253(I guess M177) ?
If I can try to replace a part (like oil pan, gaskets or something) at first, Please recommend.
Should I take apart the engine assembly for further inspection?
Since I am not an expert on mechanics, any one can address this issues and the part location with part name based on the picture below would be great.
I could be wrong, but if I'm looking at your pictures correctly, then it looks like your front differential is leaking. The 4Matic+ front differential leaking is not unheard of. There's a clutch in there operating under hydraulic pressure, so if any of the seals have dried out for example or if the diff got damaged driving over something then a leak is possible. I personally don't have experience with it or know how common it is as my AMG is RWD.
I could be wrong, but if I'm looking at your pictures correctly, then it looks like your front differential is leaking. The 4Matic+ front differential leaking is not unheard of. There's a clutch in there operating under hydraulic pressure, so if any of the seals have dried out for example or if the diff got damaged driving over something then a leak is possible. I personally don't have experience with it or know how common it is as my AMG is RWD.
Thank you for the info. I guess you are referring to the yellowish spot on the diff in the second picture (I May be wrong).
How about the rusty screw spot (seems massive leakage happened) in the last picture? The spot is located on the other side from the diff.
and is the Black plastic box oil pan?
I'll second the possibility of it being the front differential. My 2020 with 20k miles was leaking in the pre purchase inspection and I was able to have them fix it before I bought it.
Thank you for the info. I guess you are referring to the yellowish spot on the diff in the second picture (I May be wrong).
How about the rusty screw spot (seems massive leakage happened) in the last picture? The spot is located on the other side from the diff.
and is the Black plastic box oil pan?
Is this correct?
That's all part of the differential I think. I believe the black box is the electronics for the 4Matic system. The mechanics and electronics for that are all part of the front differential. It uses a multi-plate clutch to variably couple the front axle to the transmission shaft. It could also be the transmission control unit/valve body, but kinda hard to tell with these close up pics. Do you have one zoomed out further?
Last edited by superswiss; Oct 11, 2023 at 03:44 PM.
That's all part of the differential I think. I believe the black box is the electronics for the 4Matic system. The mechanics and electronics for that are all part of the front differential. It uses a multi-plate clutch to variably couple the front axle to the transmission shaft. It could also be the transmission control unit/valve body, but kinda hard to tell with these close up pics. Do you have one zoomed out further?
Unfortunatly, I couldnt take on zoomed out further, but it looks control unit because I can see the cable and the harness plug-in. THANK you for help.
That's all part of the differential I think. I believe the black box is the electronics for the 4Matic system. The mechanics and electronics for that are all part of the front differential. It uses a multi-plate clutch to variably couple the front axle to the transmission shaft. It could also be the transmission control unit/valve body, but kinda hard to tell with these close up pics. Do you have one zoomed out further?
That's all part of the differential I think. I believe the black box is the electronics for the 4Matic system. The mechanics and electronics for that are all part of the front differential. It uses a multi-plate clutch to variably couple the front axle to the transmission shaft. It could also be the transmission control unit/valve body, but kinda hard to tell with these close up pics. Do you have one zoomed out further?
Here is the zoomed out picture.
I am not if this is really about differential part.
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