Oil Separator Repair Kit — Mercedes-Benz M276 3.5L Petrol Engine
Stop Oil Consumption on Your Mercedes 3.5L V6 — Rebuild the Separator, Not Replace It.
Excessive oil use, rough idle, or crankcase faults on your Mercedes C, E, S, GL, or ML 3.5L? The M276 engine's oil separator diaphragm is a well-known wear item — and replacing only the diaphragm is the smart, cost-effective fix.
This kit includes a 52mm diaphragm and all necessary seals to fully rebuild the OEM separator assembly and restore correct crankcase ventilation.
What's Included
- 52mm replacement diaphragm — OEM-spec fit for M276
- All seals and o-rings — complete rebuild kit
Why This Kit
- M276-Specific Design: The 52mm diaphragm is matched to the M276 3.5L petrol separator — not a generic part.
- Eliminates Oil Consumption: Restores correct crankcase pressure balance and stops oil blow-by into the intake.
- Broad Platform Coverage: One kit covers the M276 engine across C, E, S, GL, ML, CLS, SLK, R-Class, and SL platforms.
- Save Hundreds: OEM replacement separators cost $150–$300+. This rebuild kit does the same job for far less.
Vehicle Compatibility
| Platform | Models |
|---|---|
| ML / GLE W166 | ML350, GLE350 |
| SLK / SLC R172 | SLK350, SLC350 |
| C-Class W204 / S204 / C204 | C350 |
| GLK X204 | GLK350 |
| E-Class W212 / V212 / S212 / C207 / A207 | E350 |
| CLS C218 / X218 | CLS350 |
| S-Class W221 / V221 / W222 / V222 / X222 | S350 |
| SL R231 | SL350 |
| R-Class W251 / V251 | R350 |
| GL / GLS X166 | GL350, GLS350 |
OEM Cross-Reference
- A2760100331
Pro Tip: On M276 engines, a failing oil separator typically causes oil residue around the intake manifold, rough cold-start idle, and oil consumption between service intervals. Addressing it early prevents intake valve coking — an expensive secondary repair on direct-injection engines.
FAQ
Q: Does this kit fit both the coupe and sedan C350?
A: Yes — C204 (coupe) and W204/S204 (sedan/wagon) all use the same M276 engine and the same separator.
Q: Is 52mm the correct diaphragm size for M276?
A: Yes. The M276 3.5L petrol separator uses a 52mm diaphragm — different from the 70mm used on diesel applications. This kit is specific to the M276.
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Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings