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M177 vs M178 — What's the Difference Between AMG's 4.0L Twin-Turbo V8 Engines?
Mercedes-AMG uses two versions of its hand-built 4.0-litre twin-turbo V8: the M177 and the M178. They share the same bore, stroke, and hot-inside-V turbo layout — but they are not the same engine and they are not interchangeable. If you are ordering an engine build, turbo kit, or any internal component, you need to know which one you have. This guide explains the differences. Quick Comparison M177 M178 Displacement 3,982 cc (4.0L) 3,982 cc (4.0L) Configuration 90° V8, DOHC, 32-valve 90° V8, DOHC, 32-valve Turbo layout Hot-inside-V Hot-inside-V Oil system Wet sump Dry sump Block casting M177-specific M178-specific Oil pan...