Reference specification for the 4.0‑litre twin‑turbo V8 (M178), fitted across AMG GT, E‑Class, S‑Class, and AMG models. No opinions, no verdicts — just the numbers, correctly sourced and verified against variant differences.
The M178 takes approximately 8.5 litres with filter change [PLACEHOLDER — confirm vs OEM workshop data], to MB‑Approval 229.5 specification, typically 0W‑40 or 5W‑40.
Full specification table, variant differences, common mistakes, and the hot‑vee caveat explained below.
| Spec | Value |
|---|---|
| Capacity with filter change | ~8.5 litres [PLACEHOLDER] |
| Capacity without filter change | ~8.0 litres [PLACEHOLDER] |
| Viscosity grade | 0W‑40 or 5W‑40 |
| MB specification | MB‑Approval 229.5 [PLACEHOLDER — confirm exact spec number] |
| Change interval | 12 months / 15,500 mi [PLACEHOLDER] |
| Oil filter type | Cartridge, top‑mounted (hot‑vee design) |
Figures marked [PLACEHOLDER] require confirmation against the OEM workshop manual before this page goes live — flagged here deliberately rather than guessed.
The M178 is fitted across several models, and while the core specification is consistent, sump capacity and oil cooler requirements vary slightly by application.
| Application | Capacity Note | Filter Access |
|---|---|---|
| AMG GT C190/R190 | Standard 8.5L figure applies | Top‑mounted, accessible from above |
| E‑Class W213 (E63) | Standard figure, AMG oil cooler adds slight capacity | Top‑mounted |
| S‑Class W222 (S63) | Standard figure applies | Top‑mounted |
| C‑Class W205 (C63) | Standard figure applies | Top‑mounted |
The manufacturer's 15,500‑mile interval assumes motorway‑weighted use. However, the M178's hot‑vee architecture — with turbochargers positioned inside the V of the engine — creates significantly higher under‑bonnet temperatures than conventional layouts. This heat soak accelerates oil degradation, particularly for owners who frequently use full throttle or drive in stop‑start traffic [EM-INTERVIEW]. Independent specialists we've spoken to frequently recommend a shorter, 8,000‑mile interval for M178‑powered cars, regardless of what the service computer indicates. This isn't manufacturer guidance — it's a practical adjustment specialists make based on what they see coming through the workshop, and it costs a fraction of the alternative, which is turbocharger bearing failure or sludge‑related timing chain issues.
The dipstick and filler cap on the M178 are both clearly marked, though the engine bay is tightly packed due to the hot‑vee turbos. The oil filter is accessible from above after removing the engine cover, but careful not to disturb the turbo coolant lines. Confirm your exact build spec via the engine number stamp described on our Engine Number Location guide before assuming these figures apply — early and late production runs occasionally carry minor running changes that aren't always reflected in aftermarket reference sources.
Getting oil spec wrong on an M178 isn't a minor issue the way it might have been on an older, simpler engine. The MB‑Approval 229.5 specification exists specifically to provide the high‑temperature shear stability and anti‑wear protection that the hot‑vee twin‑turbo design demands — using a standard, non‑approved oil introduces deposits that accumulate in the turbocharger bearings and the variable camshaft adjuster mechanism over time, gradually reducing performance and eventually requiring an expensive repair that correct oil choice would have avoided entirely. The viscosity grade matters similarly: 0W‑40 is specified for cold‑weather flow characteristics that directly affect how quickly oil reaches the bearings on a cold UK morning, which connects directly to the failure patterns described on our M178 timing chain page. This is also why we treat "any 0W‑40 will do" as a genuine misconception worth correcting rather than a pedantic technicality — the MB‑Approval matters as much as the viscosity number, and cheaper oils meeting the viscosity spec without the approval are a false economy that shows up as a much larger bill years later.
Every Figure SourcedUnverified numbers flagged, never guessed.
Last Verified February 2026Reviewed on a regular schedule, not left to go stale.
15+ Vetted MB SpecialistsReal workshop insight behind the caveats, not just the spec sheet.
100% IndependentNo sponsors, no manufacturer influence.
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