BMW X4: B58 oil filter housing gasket leak onto the exhaust
B58 oil filter housing gasket leak onto the exhaust is a common fluid leaks fault on the BMW X4 on the 2019–2024 cars, and we rate it major. Putting it right costs $600 to $1,600 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 11 documented faults on the BMW X4.
- Vehicle
- BMW X4
- Engine
- B58
- Years
- 2019–2024
- Fuel
- petrol
- System
- Fluid Leaks
What you are looking at
No photograph available
What goes wrong
The most commonly reported fault on the B58 six-cylinder is the oil filter housing gasket hardening and letting oil seep out. It runs down onto the exhaust below, which is why the first thing an owner notices is a burning smell after a drive and sometimes a wisp of smoke from the engine bay rather than a puddle on the ground. It is a well-understood job and not an expensive one by the standards of the car, but it is worth spotting because oil on a hot exhaust is a fire risk and because a seller can honestly describe it as "a small leak" without realising what it sits above. The B58 is otherwise a genuinely robust engine.
What you would notice
- Burning-oil smell after driving, strongest with the bonnet open
- Wisps of smoke from the engine bay at idle when hot
- Oil wetness or baked black residue on the side of the engine
- Oil level dropping slowly with nothing on the driveway
How to check it
Where to look. Oil filter housing on the side of the engine, above the exhaust
Open the bonnet AFTER the test drive rather than before, and smell for hot oil — that is the giveaway on this one.
Shine a torch at the oil filter housing on the side of the engine and follow the path downwards, looking for wet oil or a baked black crust on the exhaust and heat shields below.
Check the dipstick or the electronic oil level and ask the owner how often they add oil.
Look for evidence the engine bay has recently been cleaned, which can hide a leak for exactly one viewing.
If a workshop inspection is possible: ask for the leak's source to be identified in writing, since an oil filter housing gasket and a valve cover gasket look similar from above and cost differently.
What it costs to put right
$600 to $1,600 at New Zealand independent workshop rates. That is for this job on its own, not for the car.
Ask the seller
- “Has the oil filter housing gasket been replaced?”
- “Is there ever a burning smell after a drive?”
- “How much oil does it use between services?”
Now check the BMW X4 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.
Where this comes from
- Euro Premium Parts — 'BMW X4 G02 reliability guide: everything you need to know before buying'
- Engine Explained — 'BMW B58 engine reliability: common problems explained'
BMW X4 buyer questions
Is b58 oil filter housing gasket leak onto the exhaust serious on a BMW X4?
We rate it major and common on the BMW X4. The most commonly reported fault on the B58 six-cylinder is the oil filter housing gasket hardening and letting oil seep out. It runs down onto the exhaust below, which is why the first thing an owner notices is a burning smell after a drive and sometimes a wisp of smoke from the engine bay rather than a puddle on the ground. It is a well-understood job and not an expensive one by the standards of the car, but it is worth spotting because oil on a hot exhaust is a fire risk and because a seller can honestly describe it as "a small leak" without realising what it sits above. The B58 is otherwise a genuinely robust engine.
How much does it cost to fix on a BMW X4?
$600 to $1,600 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 X4 years are affected?
Our research records this fault on the 2019–2024 BMW X4. 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?
Open the bonnet AFTER the test drive rather than before, and smell for hot oil — that is the giveaway on this one. Shine a torch at the oil filter housing on the side of the engine and follow the path downwards, looking for wet oil or a baked black crust on the exhaust and heat shields below. Check the dipstick or the electronic oil level and ask the owner how often they add oil. Look for evidence the engine bay has recently been cleaned, which can hide a leak for exactly one viewing. If a workshop inspection is possible: ask for the leak's source to be identified in writing, since an oil filter housing gasket and a valve cover gasket look similar from above and cost differently. Look here: Oil filter housing on the side of the engine, above the exhaust