G Class (W465/W463A) W463 Produced 2019-2024: G550, G63 AMG W465 Produced 2025-

2021 G-63 Rear Main Seal Leaking

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Old Feb 19, 2026 | 08:15 PM
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2021 G-63 Night Black Magno
2021 G-63 Rear Main Seal Leaking

Noticed a few drops of oil on the garage floor a couple of days ago and took it to dealership. The rear main seal is leaking and needs to be replaced along with along with the oil separators. Is this a fairly common issue? The truck has 38,500 miles on it.

Last edited by TNMICH; Feb 19, 2026 at 08:17 PM.
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Old Feb 19, 2026 | 08:53 PM
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Yeah, it happens. The rear main seal can go, and the oil separators (cyclonic separators) are a known weak point on the M177 engine. Pretty common for that mileage. Good they caught it all under warranty hopefully.
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Old Feb 20, 2026 | 04:51 PM
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Yup, a possibility for any M1177 vehicle, G, S and C we see less than E... sounds like a weird nursery rhyme.

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Old Feb 20, 2026 | 07:43 PM
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W212 E63S Wagon - GSL580 - E63 - E350 - C300
Originally Posted by Highline-Autos.com
Yup, a possibility for any M1177 vehicle, G, S and C we see less than E... sounds like a weird nursery rhyme.
my theory is those of us who are in the E tend to drive a little bit of a more sporting type if you catch my drift. The majority of G wagons aren't out there on the gas as frequently
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