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Oil Separator Crankcase Breather A2700105401 Mahle Mercedes M270 M274 Used
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DESCRIPTION
At a glance
| Part | Oil separator / crankcase breather |
|---|---|
| Mercedes number | A2700105401 — A 270 010 54 01 |
| Fits | M270 / M274 1.6 CGI engines — A-Class W176, B-Class W246, CLA C117, GLA X156 |
| Manufacturer | Mahle, Mercedes-Benz OE supplier |
| Condition | used, removed from a vehicle and inspected |
| Shipping | within 24 h from Bielsko-Biała, VAT invoice |
Will it fit your car
The number on your own part decides, not the car model. Mercedes changed the design mid-production, so compare the number before you order.
| Make | Model | Body | Engine | Family |
|---|---|---|---|---|
| Mercedes-Benz | A-Class | W176 | 1.6 CGI petrol | M270 |
| Mercedes-Benz | B-Class | W246 | 1.6 CGI petrol | M270 |
| Mercedes-Benz | CLA | C117 | 1.6 CGI petrol | M270 |
| Mercedes-Benz | GLA | X156 | 1.6 CGI petrol | M270 |
Not sure? Send us a photo of your separator and your VIN. We check it against the catalogue and confirm before shipping — we would rather check twice than handle a return.
Part numbers
| Number | What it is | Where to find it |
|---|---|---|
| A2700105401 | Mercedes catalogue number | cast into the side of the housing, next to the star |
| A 270 010 54 01 | same number, factory spacing | same place |
| 2046250915 | Mahle manufacturer marking | on the flat wall of the housing |
What this part does
The oil separator returns blow-by gases from the crankcase to the intake and strips the oil mist out of them. The built-in diaphragm valve regulates the vacuum in the system.
A worn diaphragm is one of the more common failures on M270 and M274 engines — it cracks with age, and the engine then draws air through an unmetered path.
When it needs replacing
| Symptom | What to look at |
|---|---|
| Whistling from under the rocker cover | loudest at idle, quietens when you open the throttle |
| Raised idle speed | the engine draws air through the cracked diaphragm |
| Oily intake, oil consumption | the separator no longer catches the oil mist |
| Dipstick or filler cap pushed out | overpressure in the crankcase |
| Lean mixture fault (P0171) | after ruling out other intake leaks |
A one-minute test: with the engine running, put your hand over the oil filler. Clear suction — or the opposite, a push — points to the separator.
Technical data
| Parameter | Value |
|---|---|
| Manufacturer | Mahle |
| Country of manufacture | Romania |
| Material | plastic, diaphragm valve |
| Fitting side | not applicable — non-sided part |
| Weight with packaging | approx. 0.6 kg |
Condition, shipping and warranty
Used part, genuine Mahle, removed from a vehicle and inspected before listing. The housing shows normal signs of use that do not affect function.
VAT invoice with every order. Dispatched within 24 h from our warehouse in Bielsko-Biała, Poland.
Questions we get most often
Do I need a workshop to fit it? It is a job on top of the engine, with no electronics and no coding. With basic tools you can do it yourself. Replace the port seals while you are there — old ones tend to leak once disturbed.
Will it work on the 2.0? The confirmed fit is for the 1.6 CGI. On the 2.0 the number is sometimes different — write to us with the number from your own part.
I have a raised idle and a whistle — is it definitely the separator? Usually yes, but rule out the intake hoses and the rocker cover gasket first. The separator is the most common cause, not the only one.
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