BMW E92 Oil Leaks: Valve Cover & Filter Housing Gaskets
A faint burning smell and a little smoke after a drive? On the N52, N54 and N55 it's almost always one of two gaskets — the valve cover or the oil filter housing. Here's how to tell which is leaking, and how to reseal both yourself.
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These two leaks are so common on the E9x sixes they're almost a rite of passage. Both are gasket jobs you can do at home with hand tools, and tackling them together is smart — you'll likely have access to both areas at once. First, work out which one you've got.
Which Leak Is It?
The location of the oil — and what it's dripping onto — tells you.
| Sign | Valve Cover Gasket | Oil Filter Housing Gasket |
|---|---|---|
| Where the oil sits | Top of the engine, running down the side toward the exhaust | Around the oil filter housing, running down the front/side |
| Burning smell & smoke | Yes — oil drips onto the hot exhaust manifold | Possible, if it reaches the exhaust |
| Oil in the spark-plug wells | Yes — can soak the coils and cause misfires | No |
| Oil on the accessory belt | No | Yes — and that's the urgent one |
Clean the area with degreaser, drive a few days, and see where fresh oil reappears — that confirms the source before you order parts. Often both are weeping at once, which is why many owners do the pair.
Parts & Tools You'll Need
Buy the full gasket sets — they include the small seals you'll need.
Oil on the belt? Don't wait
An oil-filter-housing leak can drip onto the accessory (serpentine) belt. Oil-soaked belts swell, slip and fail — and a thrown belt takes out your water pump drive and charging. If you see oil on the belt, treat the repair as urgent and inspect the belt for damage while you're in there.
Repair 1: Valve Cover Gasket
Remove the Cover, Coils & Obstructions
Cool engine. Take off the plastic engine cover, unplug and pull the ignition coils (label them), and move aside any intake ducting, cable channels or the cabin-filter housing blocking the valve cover.
Unbolt the Valve Cover
Remove the perimeter bolts, keeping track of the grommets under them. Lift the cover off and remove the old gasket, the spark-plug well seals and the bolt grommets.
Clean & Inspect
Clean the sealing surfaces completely. Inspect the plastic cover for warping or cracks — an N52 cover that's distorted should be replaced, since a new gasket won't seal a warped cover.
Fit the New Gasket & Seals
Seat the new perimeter gasket, spark-plug well seals and bolt grommets. Add a small dab of RTV at any corner/half-moon points your gasket instructions specify.
Reinstall & Torque in Sequence
Set the cover down evenly and torque the bolts to the low spec in the correct cross/sequence pattern. Don't overtighten — the plastic cover cracks if you do.
Reassemble & Test
Refit the coils and everything you moved, run the engine and check the seam for leaks. If oil had reached the plug wells, fit fresh plugs and coils too.
Repair 2: Oil Filter Housing Gasket
Access the Housing
Move aside any intake tube or bracket blocking the oil filter housing, and place a drain pan below — expect some oil to spill when the housing comes off.
Unbolt & Remove the Housing
Remove the housing bolts, lift the housing away from the block, and peel off the old gasket. Note the orientation and any O-rings.
Clean & Fit the New Gasket
Clean both mating faces, fit the new profile gasket (and any O-rings) into the housing, and reseat it squarely on the block.
Torque & Test
Torque the bolts to spec, top up any lost oil, run the engine and check around the housing for leaks. Clean once more and re-check after a few drives.
Quick Specs
General guidance — verify for your exact engine.
| Item | Detail |
|---|---|
| Valve cover parts | Perimeter gasket + spark-plug well seals + bolt grommets (full set) |
| Cover torque | Low torque, in sequence — don't crack the plastic cover |
| Sealant | A dab of RTV at corner/half-moon points only, per the gasket |
| Oil filter housing | New profile gasket + O-rings; torque to spec |
| After the job | Clean, run, and re-inspect after a few drives |
FAQ
How do I know which gasket is leaking?
By where the oil is. Valve-cover leaks sit high on the engine and run down toward the exhaust (burning smell, oil in the plug wells); oil-filter-housing leaks appear around the housing and can reach the belt. Clean the engine and drive a few days to see where fresh oil returns.
Is an oil leak urgent?
A small valve-cover weep can be monitored, but fix it before oil pools in the plug wells and causes misfires. An oil-filter-housing leak that's reaching the accessory belt is urgent — an oil-soaked belt can fail.
Can I do this myself?
Yes. Both are gasket jobs with hand tools. The filter housing is a quick job; the valve cover takes longer because of the coils and obstructions to remove, but it's well within DIY reach with patience and a torque wrench.
Should I replace the whole valve cover?
If the plastic N52 cover is warped or cracked, yes — a fresh gasket won't seal a distorted cover. If the cover is flat and sound, a new gasket set is all you need.
Will the leak cause misfires?
It can. If a valve-cover leak lets oil into the spark-plug wells, it soaks the coils and triggers misfires. Reseal the cover and replace any oil-fouled plugs and coils.
You're Done
That's the E9x's two classic leaks sorted — a fresh valve cover gasket and oil filter housing gasket for the price of parts and an afternoon. Diagnose by location, do both together while you're in there, torque the plastic cover gently, and clean up so you can confirm the fix. Feed it the right oil and head back to the E92 hub for the rest.