Buyer Research

2011 BMW 335i (E90 N55) — Should You Buy One?

Typical asking price: $12,000–$20,000. There are 2 high-severity known issues you need to know before handing over a check.

Kestrel Take

A tuner favorite and a genuine sleeper — the N55 single-turbo straight-six makes big power cheaply and drives beautifully. It's also a used German performance car, which means a maintenance budget and a specialist are mandatory. The N55 is more reliable than the twin-turbo N54, but nothing here is cheap to fix.

Known Issues for the 2011 BMW 335i (E90 N55)

Ranked by wallet impact. These are documented, recurring problems — not freak accidents.

Oil filter housing gasket and valve cover leaksHigh — wallet impact

Both leak by 80k-100k miles, dropping oil onto the belt and exhaust. A staple N55 repair.

Repair cost range: $600-$1,600

Water pump and thermostat failure (electric)High — wallet impact

The electric water pump fails without warning and overheats the engine fast; most replace it preventively.

Repair cost range: $900-$1,600

Carbon buildup and wastegate rattleMedium

Direct injection carbon needs walnut blasting, and the turbo wastegate develops a rattle.

Repair cost range: $500-$2,500

Modification and tuning stressMedium

Many are tuned (the N55 loves it), which stresses the drivetrain — verify the tune and clutch/DCT health.

Repair cost range: Varies

Walk-Away Red Flags

✗Overheating history
✗Oil leaks left unaddressed
✗An aggressive tune with no records
✗No BMW specialist history

Good Signs

✓Water pump, gaskets, and carbon already done with receipts
✓Stock or a documented conservative tune
✓A BMW independent in the service file
✓Healthy clutch or DCT

Found a specific BMW 335i (E90 N55)?

This page covers what goes wrong on the 2011 BMW 335i (E90 N55) in general. The Kestrel report covers this specific car— the asking price vs. market, the photos, the seller's description, and a BUY / NEGOTIATE / WALK AWAY verdict with a negotiation script.

Get My Verdict — $7.99

No account required. Delivered to your inbox, usually within minutes.

Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.