N63 Valve Stem Seals: Buyer Beware

IA EURO illustration of three N63 valve stem seals: two worn ones, hard and cracked with the hole opened up, and a new one tight on the stem — Traced from a forum member's photo of seals pulled from an N63, shared on xbimmers.

The N63 V8 is known for drinking oil, and worn valve stem seals are one of the reasons. BMW wrote bulletins on replacing them for the first two generations. What the job costs depends on which N63 you buy. Here's what BMW has said, what it hasn't, and how to shop for one.

Which N63 you're looking at

Original N63US 2009 to 2014X5 and X6 xDrive50i (E70, E71), ActiveHybrid X6, 750i and 750Li (F01, F02), ActiveHybrid 7, 550i GT (F07), 550i (F10), 650i (F12, F13). BMW seal bulletin SI B11 08 15: done in the car.

N63TUUS 2013 to 2019750i and 750Li (F01, F02), 650i coupe, convertible and Gran Coupe, 550i GT, 550i (F10), X5 xDrive50i (F15), X6 xDrive50i (F16). Some of these were built with both engines: the build date decides. BMW seal bulletin SI B11 01 17: engine out.

N63TU2 and TU32016 on750i (G11, G12), M550i, M850i, X5 and X7 xDrive50i, M50i. No BMW seal bulletin and no settlement that we could find. Unknown is not the same as safe.

Why they fail: BMW hasn't said

The usual story is heat. The N63 puts both turbos inside the V, right between the heads. That theory comes from the class action complaint, shops and forums. BMW has never published a cause. The closest BMW comes is a 2012 bulletin saying the N63's crankcase vent lines go brittle from engine bay heat.

32 sealsOne per valve, two BMW kits of 16. The parts are under $200. The labor is the bill.

On the N63 the seal is molded onto the lower spring plate, one piece. BMW changed the kit number in September 2017, from 11 34 0 039 494 to 11 34 0 054 492. BMW's parts catalog shows the same seal part inside both kits, and BMW never said why the number changed.

"The TU fixed it" and "BMW went to a new seal material" both get repeated a lot. Neither has a BMW source. BMW wrote a separate seal bulletin for the TU in 2017, and BMW's own repair list for the 2022 TU settlement includes new seals.

What BMW calls normal

BMW's general rule (SI B11 03 13) is that its engines can use up to 1 quart of oil per 750 miles, and turbo engines use more than non-turbo ones. The test in the N63TU settlement uses 1 liter per 750 miles. Same idea, slightly different number.

BMW's bulletins approve new seals when the car shows:

Smoke on start-up or on hard acceleration and deceleration, plus high oil use, or
Oil-fouled spark plugs plus high oil use, or
High oil use alone, once a full BMW consumption test has been done.

If the smoke shows up with the engine hot, BMW sends the tech to other causes first: compression, leak-down, the vent lines and the turbo pipes.

Smoke: what points where

Valve stem sealsBMW: smoke on start-up and on hard on and off throttle. Shops add a puff after the car has sat or idled a long time, which clears once you drive.

Vent linesBMW: white or blue smoke with rough running, oil in the intake. Far cheaper than seals. Rule it out first.

Turbo sealsBMW: oil inside the turbo inlet pipes, judged against BMW's own chart. A small amount is normal.

Rings and cylindersCompression that varies by more than 2.5 bar (36 psi) between cylinders fails BMW's N63TU settlement test.

LeaksOil disappears with no smoke. Check the front cover, both oil pans, the rear seal area and the valley between the heads.

What BMW's job really is

Original N63SI B11 08 15, 2015 to 2017The engine stays in the car. Camshafts come out one bank at a time, each valve is held shut with air through the spark plug hole, and the seals are changed with the heads on. BMW's warranty time: 85 units plus 3 for the oil service plus the camshaft removal operation.

N63TUSI B11 01 17, 2017The engine comes out on the front axle and goes on a bench. Heads, camshafts and turbos stay on. BMW's warranty time: 110 units plus engine removal and installation.

The old wayEngine and transmission out, heads off. BMW's bulletins replaced this.

TU2 and TU3No BMW seal procedure found.

Each method has its own special tool kit, built for BMW by AGA Tools: 83 30 2 408 268 for the original N63, 83 30 2 450 434 for the TU. BMW's parts list for the job goes well past the seals: both valve cover gaskets, the chain tensioner cover and high pressure pump gaskets, four VANOS bolts, eight injector seals and decoupling elements, oil, filter and coolant.

Who pays: warranty, the care package, the lawsuits

The Customer Care Package did not include valve stem seals. It covered six items on the original N63 (injectors, vent lines, air mass sensors, vacuum pump, a low pressure fuel sensor and turbo intake seals). A CCP sticker proves the CCP, not seals.
New car warranty or BMW CPO covered seals when BMW's symptom rules were met. At these ages that's rare.
Bang v. BMW (original N63, model years 2009 to 2014): settled, effective October 2018. Claims for past costs closed in 2018. Service benefits ran 10 years or 120,000 miles from the in-service date. By our read every car has aged out.
Isley v. BMW (N63TU, model years 2013 to 2019): benefits started February 9, 2022. After a failed oil consumption test, BMW's repair list includes new seals. It now runs only within 10 years and 120,000 miles of the in-service date, so only late cars still qualify, roughly those first sold after October 2016. An oil service overdue by more than 5,000 miles voids it. Only a BMW dealer can see a car's settlement status from the VIN.

What it costs

Seal kits, Genuine BMW, two needed$94.99 each

Independent shop, in the car$3,500 to $6,000

BMW dealer, owner reported$8,000 to $9,000

BMW seal tool kit, if you DIY$1,449

Kit and tool prices read October 20, 2026. The shop numbers are older: published quotes from 2015 to 2018 on the original N63. We found no current quotes and none for the TU, where the engine comes out. Shops usually add timing chains, vent lines, coolant hoses, turbo oil lines and valve cover gaskets while it's apart, so ask what's in the number.

Buying one: paper

Seals done? The invoice should show two seal kits (11 34 0 039 494 or 11 34 0 054 492), or a head gasket set with them inside.
At a dealer, the repair order shows defect code 1134064800 and labor 11 34 570 (original N63) or engine removal plus 00 50 000 (TU).
The oil log. How much, how often. "Burns a little" with no numbers is a no.
Settlement history: any oil consumption test, repair or replacement engine. A swapped engine loses settlement coverage.
Oil service dates. A service overdue by more than 5,000 miles costs settlement coverage.

Buying one: the car

See it start cold. Ask the seller not to warm it up. Watch the tailpipe on start-up, then again after 10 minutes of idling and a few blips.
A shop with ISTA can read misfire counters and lean faults, pull a plug or two for oil fouling, and run compression or leak-down.
Look at the vent lines and turbo inlet pipes for oil. That's the cheaper fix that gets mistaken for seals.
Have a BMW dealer run the VIN for open campaigns and settlement status.

Questions for the seller

Have the valve stem seals been replaced? When, at what mileage, by whom? Invoice?
How much oil does it use between changes? Do you have a log?
Any smoke on start-up, after idling, or when you lift off the throttle?
Was the Customer Care Package done? Any settlement oil test or repair?
Is this the original engine?

Price it by generation. An original N63 with no seal invoice: assume you may pay for seals, $3,500 and up at an independent shop. An N63TU: the engine comes out, so expect more, and check the settlement by VIN first. TU2 and TU3: no BMW history either way, so the oil log and a cold start matter even more.

While you're checking an N63

Timing chainsOriginal N63. BMW has a chain test plan (SI B11 16 14).

Crankcase vent linesBrittle with heat (SI B11 07 12). Cheap, and they mimic bad seals and bad turbos.

InjectorsShould be index 11 or higher. Part of the Care Package.

Turbo oil linesBMW bulletin SI B11 07 11.

RecallsRun the VIN at nhtsa.gov/recalls.

N63 oil and PCV guide →N63 oil change kit $210.99 →N63 engine guide →

BMW facts come from BMW's US service bulletins filed with NHTSA, BMW's repair instructions and BMW's parts catalog for the N63. Settlement terms come from the class notices and BMW's settlement bulletins. Shop and owner reports are labeled as such. Prices for kits and tools were read October 20, 2026; shop quotes are older, as noted.