Mercedes Complete Engine Engine GLC63 AMG M177 177

the M177 engine in the Mercedes-AMG GLC63 (X253) remains one of the most powerful and technically complex V8s in the AMG lineup. Specifically, the variant used in the GLC63 is the M177.980, a 4.0-liter Biturbo “Hot V” engine.

As the automotive world moves further toward hybridization, a complete, running M177 has become a highly valuable asset for both repairs and high-end performance swaps.

1. Technical Specifications

The M177.980 is distinguished by its “Hot Inner V” configuration, where the turbochargers are placed inside the V of the engine banks for immediate throttle response and compact packaging.

2. 2026 Market Pricing (Estimated USD)

Replacing a complete M177 is a significant financial undertaking. By 2026, prices for used units have remained high due to the rarity of high-performance V8s.

3. The “Hot V” Maintenance Warning (2026)

By 2026, earlier GLC63 models (2018–2020) are reaching age/mileage points where specific “Hot V” heat-related issues occur:

• Coolant Lines: The plastic and rubber coolant lines feeding the turbos inside the “V” can become brittle due to extreme heat. If buying a used engine, these must be replaced with the updated metal or high-heat variants.

• Ignition Coils: The heat trapped in the “V” also shortens the life of the ignition coils and spark plugs. Expect to replace these every 25,000–30,000 miles.

• Oil Separators: Failing oil separators can lead to high crankcase pressure and oil leaks. This is a common 2026 maintenance item for high-mileage M177s.

4. Installation & Compatibility

• Active Engine Mounts: The GLC63 S uses dynamic engine mounts. If you are swapping an S engine into a non-S car, you will need the appropriate wiring and ECU coding to control these mounts.

• 4MATIC+ Interface: The GLC63 uses a specific oil pan and front differential interface to accommodate the 4MATIC+ all-wheel-drive system. An M177 from a rear-wheel-drive C63 is not a direct bolt-in for a GLC63 without significant modifications to the lower block/pan area.

• ECU / VIN Pairing: The M177 is digitally locked. You will need Xentry/DAS programming to pair the engine control unit with the transmission and ignition system.

5. 2026 Performance Tip

The M177 is remarkably robust. By 2026, many owners are opting for “Stage 2” setups when performing an engine swap. With just downpipes and a remap, this engine can reliably push 600+ hp, though this significantly increases the heat load on the factory cooling system.