Which BMW Has the S55 Engine? Full Model List + Reliability Breakdown
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The S55 is one of those BMW engines people talk about like it’s a legend… and to be fair, it kind of is. It’s the twin-turbo straight-six that powered the golden era of F-generation M cars — the ones that feel fast even by today’s standards, and still have that raw “proper M car” personality.
If you’re here to figure out which BMW has the S55 engine, or you’re browsing cars and trying to confirm what’s under the bonnet, you will find the straight answer to your question below.
What is the S55, in plain English?
The S55 is BMW M’s 3.0-litre twin-turbo inline-six. It replaced the old V8-era madness with something lighter, sharper, and very tunable. You’ll also see the engine referenced as S55B30A in some listings, useful as a clue, but not something you should rely on alone when buying BMW parts or engines.
Full model list: BMWs that came with the S55
Here’s the list you can trust.
If a listing claims “S55” in something outside this list, it’s either wrong, confused, or talking about an engine swap.
Is the S55 reliable?
Most of the time: yes — if it’s been looked after. But the S55 is also one of those engines where the same model can be either:
a well-maintained daily routine that runs forever, or
a heavily tuned car that’s lived on launch control and aggressive maps
So reliability comes down to ownership history more than the engine itself.
Here are the real issues enthusiasts actually care about.
The known issues (what to watch for)
1) Crank hub slip (the famous one)
This is the big topic.
It doesn’t happen to every car, and plenty of stock S55s never have a problem. But if it does happen, it can get expensive fast, because timing can go out.
What tends to increase risk?
Big torque tunes
Lots of hard launches
Repeated high-load driving (especially with modifications)
If you’re buying an S55 car, don’t just ask, “Has the crank hub been done?” Ask:
Was it tuned? For how long?
Any track use?
Any proof of work or receipts?
A clean history matters more than a confident seller.
2) Carbon buildup (normal direct-injection stuff)
Like a lot of modern direct-injection engines, the S55 can build carbon on the intake valves over time.
Common signs:
rough idle
misfires
car feels a bit “not as sharp” as it should
It’s not a death sentence; it’s maintenance. Just something to keep in mind on higher mileage cars.
3) Oil leaks (welcome to BMW ownership)
Gaskets and seals age. Heat cycles do their thing. The S55 is not immune. It’s usually fixable, but what you don’t want is a car that’s been leaking forever with no proper repair.
Buying parts or an engine: the easiest way to avoid a bad purchase
If you’re looking to buy an S55 engine or even just car parts, the biggest mistake is trusting the listing title. “S55” in a description doesn’t guarantee anything.
The checklist for you (recommendation from BMW breakers):
Ask for the BMW part number
Get clear photos of labels and stamps
Confirm donor details (model/year — VIN match is best)
Confirm what’s included (bare engine vs “complete” setup)
This matters a lot if you’re comparing prices for a replacement engine, because two “S55 engines” can be totally different depending on what comes with it.
Why S55 prices vary so much
People get confused because the market mixes:
bare engines
long blocks
“complete” engines with turbos/ancillaries/loom
engines pulled from different variants and conditions
So the pricing gap isn’t always “cheap vs expensive”. Sometimes it’s simply incomplete vs complete.
FAQ
Which BMWs came with the S55?
F80 M3, F82/F83 M4, F87 M2 Competition, and F87 M2 CS.
Is the S55 good for daily driving?
Yes — when stock or sensibly modified, with consistent maintenance.
Should I avoid tuned S55 cars?
Not automatically. Some are built properly and maintained better than stock cars. The risky ones are the “big power, no paperwork” setups.
What does S55B30A mean?
It’s an engine code reference you’ll see tied to the S55 family. Still, the safest way to confirm anything is with part numbers and fitment checks.
What should I check before buying an S55 car?
Service history, signs of oil leaks, how it was used (stock vs tuned), and whether the car has a proper paper trail.
Disclaimer: this guide is general information. BMW specifications can vary by model year, market, and options. Always confirm fitment using part numbers and VIN-based checks before buying parts or engines.
