2011 BMW 335i Engine for Sale – Tested N55 Power at the Best Price

If you're searching for a 2011 BMW 335i engine for sale, you're looking for one of the most capable inline-six turbocharged engines BMW ever produced. The 335i sits at the sweet spot of the BMW 3 Series lineup  refined enough for daily driving, powerful enough to embarrass dedicated sports cars, and robust enough to support serious performance modifications. Whether your original engine has suffered a catastrophic failure, taken on water, or simply accumulated too many miles to rebuild economically, a quality used replacement is the fastest and most affordable path back to the road.

This guide covers everything you need to know  the engine specs, common issues to watch for, how to buy smart, and where to find a tested, warrantied unit without the guesswork.

The Engine Inside the 2011 BMW 335i

The 2011 BMW 335i is powered by the N55B30  a 3.0-litre single-turbocharged inline-six engine producing 300 hp and 300 lb-ft of torque. The N55 replaced the twin-turbocharged N54 in the 335i lineup starting in 2011, bringing with it a twin-scroll single turbocharger, Valvetronic variable valve lift, and Double-VANOS variable camshaft timing. The result is an engine that delivers smoother power delivery, improved fuel efficiency, and reduced complexity compared to its predecessor — while still being an absolute joy to drive.

The N55 is widely regarded as one of the finest engines BMW has ever built, and it forms the foundation of some of the most popular engine swap and tuning projects in the enthusiast community today.

N55 vs N54 – Which Engine Does the 2011 335i Use?

This is one of the most commonly asked questions about the 335i, and it matters when buying a replacement engine. The answer is straightforward: 2011 and later 335i models use the N55, while 2007–2010 models used the N54. The two engines are not interchangeable without significant modifications, so confirming the engine code before purchase is essential.

Key differences at a glance:

• N54: Twin turbo, port injection only, higher tuning ceiling stock
• N55: Single twin-scroll turbo, direct injection + Valvetronic, smoother power curve, simpler maintenance
• Compatibility: N55 requires different software, wiring harness connections, and ancillary mounts compared to the N54

Always verify the engine code stamped on the block matches N55B30A before completing any used engine purchase for your 2011 335i.

Common Problems with the BMW N55 Engine

The N55 is reliable by performance engine standards, but like any high-output motor, it has known weak points. Understanding these helps you inspect a used engine more effectively and anticipate future maintenance needs.

1. High-Pressure Fuel Pump (HPFP) Early N55 units occasionally suffered HPFP failures causing rough running and hesitation. Most affected units have already been replaced under warranty or by previous owners, but always confirm the pump's condition.

2. Oil Filter Housing Gasket Leak One of the most common N55 issues. The plastic oil filter housing gasket degrades over time and leaks oil onto the exhaust, creating smoke and potential fire risk if left unaddressed. Inspect any used engine carefully around this area.

3. Valve Cover and Valve Cover Gasket The N55 valve cover is plastic and prone to cracking, especially on high-mileage engines. Gasket leaks are common and should be addressed at installation time.

4. Wastegate Rattle Some N55 engines develop a cold-start rattle caused by wastegate wear inside the turbocharger. It typically disappears once the engine warms up, but it is worth investigating on any used unit.

5. Water Pump and Thermostat The electric water pump on the N55 has a finite lifespan and is a known failure point. When sourcing a used N55, factor in the cost of replacing the water pump and thermostat as preventive maintenance during installation.

What to Look for When Buying a Used 2011 BMW 335i Engine

Buying a used BMW engine requires more than just checking the mileage. Here's a complete inspection checklist:

• Confirm engine code: Must be N55B30A for the 2011 335i
• Check compression: All six cylinders should read within 10% of each other
• Inspect for oil leaks: Pay particular attention to the oil filter housing, valve cover, and rear main seal
• Check the turbo: Spin the impeller by hand — no excessive play or grinding
• Look for coolant contamination: Milky oil is a head gasket red flag
• Ask about the VANOS solenoids: Faulty solenoids cause rough idle and poor performance
• Request mileage documentation: Under 80,000 miles with service records is the sweet spot for a used N55

Why the BMW N55 Is a Top Choice for Engine Swaps

Beyond the 335i replacement market, the N55 has become one of the most popular swap engines in the enthusiast world. Its compact dimensions, robust bottom end, and enormous tuning potential — with supporting modifications, N55 builds regularly push 600+ hp — make it a compelling choice for track builds, sleeper builds, and custom projects. Compatible platforms include the BMW 1 Series, Z4, X3, and even non-BMW chassis in purpose-built race applications.

If you're sourcing an N55 for a swap rather than a direct replacement, confirm the ancillary components you'll need: engine mounts, oil cooler lines, charge pipes, and the DME (engine control unit) that matches the engine's specific build date.

Frequently Asked Questions (FAQs)

Q: How much does a used 2011 BMW 335i engine cost? A used N55 engine typically ranges from $2,500 to $5,500 depending on mileage, condition, and whether ancillary components are included. Low-mileage units with documentation command a premium but represent the best long-term value.

Q: How many miles will a BMW N55 engine last? With consistent maintenance — oil changes every 5,000–7,500 miles, cooling system upkeep, and timely gasket replacements — the N55 routinely reaches 150,000 to 200,000 miles without major internal failure.

Q: Is the N55 better than the N54? For reliability and daily driving, most owners prefer the N55 due to its simpler turbo setup and Valvetronic system. For all-out tuning potential, the N54's twin-turbo setup has a slightly higher ceiling. Both are outstanding engines.

Q: Will a used N55 pass emissions testing? Yes — as long as the engine code matches your vehicle's original specification and all emissions components (O2 sensors, catalytic converters) are intact and functional, a used N55 should pass emissions without issue.

Q: Does the 2011 BMW 335i use timing chain or timing belt? The N55 uses a timing chain, not a belt. Chains are designed to last the life of the engine under proper maintenance, though stretched chains on neglected high-mileage units can cause rough running and fault codes.

Q: Can I install a used BMW N55 engine myself? An experienced home mechanic with BMW-specific knowledge can complete this swap, but professional installation is strongly recommended. The N55 requires DME coding, VANOS calibration, and a post-installation diagnostic scan to ensure all systems communicate correctly.

Get Your 2011 BMW 335i Engine from Turbo Auto Parts

Stop wasting time scrolling through unreliable listings and unverified junkyard pulls. Turbo Auto Parts stocks a wide selection of tested, low-mileage BMW N55 engines ready to ship nationwide — each one inspected for compression, leaks, and turbo condition before it ever leaves the warehouse.

Whether you need a direct N55B30A replacement for your 2011 335i or an engine for a custom performance build, Turbo Auto Parts has the inventory, the technical expertise, and the customer support to make your project a success from day one.

N55 engine code verified | Compression tested | Leak inspected | Warranty included | Nationwide shipping

Don't let a failed engine keep you off the road. Contact Turbo Auto Parts today and get your 2011 BMW 335i engine at the best price available.