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BMW 3 Series: N52 Oil Filter Housing Gasket External Oil Leak

N52 Oil Filter Housing Gasket External Oil Leak is a very common fluid leaks fault on the BMW 3 Series on the 2005–2012 cars, and we rate it major. Putting it right costs $500 to $1,200 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 88 documented faults on the BMW 3 Series.

Vehicle
BMW 3 Series
Engine
N52
Years
2005–2012
Fuel
petrol
System
Fluid Leaks

This page covers the BMW 3 Series as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All BMW 3 Series faults88 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Catalytic converter yet. We would rather show none than show a picture of a different part.

What goes wrong

The N52 engine oil filter housing is bolted to the side of the block and sealed by a multi-lip rubber gasket. This gasket hardens and shrinks with age and heat cycling, allowing oil to weep down the side of the block and drip onto the exhaust. The leak is often first noticed as a burning oil smell from the engine bay or a persistent low-level oil loss between services. Left unaddressed, the leak can foul oxygen sensors and the catalytic converter. Replacement requires draining the cooling system and removing the housing. A very common E90/E92 fault documented extensively on Bimmerpost and confirmed by independent workshops.

What you would notice

  • Burning oil smell from engine bay, especially after spirited driving
  • Oil staining on the lower left side of the engine block
  • Slow but consistent oil level loss between oil changes
  • Smoke from the exhaust or engine bay when engine is hot

How to check it

Where to look. Left side (passenger side) of the N52 engine block — oil filter housing mid-block

With the engine warm, inspect the passenger/left side of the engine block (viewed from the front) for oil staining running down from the filter housing. The housing sits mid-block on the N52. Check the area around the housing for fresh oil seeping — old dried oil is less concerning than wet oil. Check oil level relative to last service interval.

Parts involved: Catalytic converter.

What it costs to put right

$500 to $1,200 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the oil filter housing gasket been replaced?”
  • “Is there any known oil leak on the car?”
  • “How frequently has the oil been topped up between changes?”

Now check the BMW 3 Series you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

BMW 3 Series buyer questions

Is n52 oil filter housing gasket external oil leak serious on a BMW 3 Series?

We rate it major and very common on the BMW 3 Series. The N52 engine oil filter housing is bolted to the side of the block and sealed by a multi-lip rubber gasket. This gasket hardens and shrinks with age and heat cycling, allowing oil to weep down the side of the block and drip onto the exhaust. The leak is often first noticed as a burning oil smell from the engine bay or a persistent low-level oil loss between services. Left unaddressed, the leak can foul oxygen sensors and the catalytic converter. Replacement requires draining the cooling system and removing the housing. A very common E90/E92 fault documented extensively on Bimmerpost and confirmed by independent workshops.

How much does it cost to fix on a BMW 3 Series?

$500 to $1,200 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which BMW 3 Series years are affected?

Our research records this fault on the 2005–2012 BMW 3 Series. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

With the engine warm, inspect the passenger/left side of the engine block (viewed from the front) for oil staining running down from the filter housing. The housing sits mid-block on the N52. Check the area around the housing for fresh oil seeping — old dried oil is less concerning than wet oil. Check oil level relative to last service interval. Look here: Left side (passenger side) of the N52 engine block — oil filter housing mid-block