Alpina is a registered manufacturer rather than a tuner, and the B3 Biturbo is its take on the F30 3 Series: a grand tourer built around BMW's N55 inline-six but fitted with two turbochargers in place of the standard single unit, a forged crankshaft, and Alpina-specific engine calibration. The B3 Biturbo was built from March 2013 to February 2017 with 410 hp, and the B3 S replaced it from March 2017 with 440 hp, running until July 2018 as the F30 saloon and until June 2019 as the F31 Touring, so the 2019 cars are Tourings only. Both are available as a saloon and a Touring estate with rear-wheel drive or xDrive, and both sit between the standard 335i and the track-focused M3, prioritising high-speed refinement and long-distance comfort.· more· less
Refined twin-turbo power deliveryBMW dealer network for servicing
Alpina-specific turbo hardware is costlyScarce Alpina-specific parts
Buy if: You want a refined high-performance 3 Series with grand touring character and can budget for specialist parts when needed.
Avoid if: You cannot accommodate occasional expensive turbo or cooling system repairs, or you need a wide choice of used examples to compare.
Alpina fits two turbochargers on Alpina-specific hardware that is expensive to recondition or replace · more· less
The B3 Biturbo replaces the standard N55's single twin-scroll turbocharger with two smaller wastegate-controlled turbochargers derived from the N54 units, together with Alpina-specific intake and charge cooling. Boost delivery is smoother, but there are two turbochargers to maintain instead of one and the hardware is Alpina-specific rather than shared with the volume N55. Bearing and shaft seal wear are the usual failure modes, and stretched oil change intervals bring them on sooner. Reconditioning the pair typically costs €1,500-3,000 at a specialist, while full replacement of both units can reach €5,000-8,000 including labor. Parts are ordered through Alpina rather than taken from BMW dealer stock, so prices and lead times are higher than on a 335i. Issues typically appear above 120,000 km. Symptoms include reduced boost pressure, unusual turbo whine, or rising oil consumption from worn seals.
Electric water pump failure
€800 - 1,4002 of 6
The N55's electric water pump can fail without warning at variable mileages · more· less
Like all N55-powered BMWs, the B3 uses an electric water pump with a composite impeller. It can fail suddenly, typically between 80,000 and 150,000 km but sometimes earlier. Symptoms include rapid overheating, a coolant warning on the dashboard, or the cooling fan running at full speed. On the B3 Biturbo, overheating is particularly serious as it can damage the turbochargers. Replacement costs €800-1,400 at a BMW workshop; the thermostat housing is usually replaced at the same time since it shares the coolant circuit. Many specialists recommend preventive replacement at 100,000 km as insurance.
Valve cover and PCV diaphragm failure
€700 - 1,2003 of 6
The plastic valve cover warps and the integrated PCV diaphragm tears, causing oil leaks · more· less
The N55 valve cover is made of plastic with an integrated positive crankcase ventilation (PCV) diaphragm that cannot be serviced separately. Over thousands of heat cycles the plastic becomes brittle and can crack or warp, and the rubber PCV diaphragm tears. Symptoms include oil leaks (often with a burning smell from oil dripping onto the exhaust manifold), rough idle, and diagnostic codes related to crankcase ventilation. The entire valve cover assembly must be replaced. Repair costs €700-1,200 at an independent shop including parts and approximately 4 hours of labor. This commonly appears between 100,000 and 150,000 km and is considered almost inevitable at high mileage.
Oil filter housing gasket leak
€400 - 9004 of 6
The oil filter housing gasket degrades and leaks oil onto the serpentine belt · more· less
The rubber gasket sealing the oil filter housing to the engine block hardens and shrinks over time, allowing oil to seep out. On the N55, the oil filter housing sits at the front of the engine, and leaked oil often drips onto the serpentine belt and belt tensioner below. If left unaddressed, oil contamination can cause the belt to slip or fail, which stops the alternator from charging and can leave belt debris in the front of the engine. Steering assistance on the F30 and F31 is electric, so it is not affected by a belt failure. The gasket itself costs under €20, but access is tight and labor is approximately 3-4 hours. Independent workshops typically charge €400-600, while BMW dealers may charge €600-900. Commonly appears after 80,000 km.
Oil pan gasket leak
€900 - 1,8005 of 6
Oil pan gasket seeps, requiring partial subframe removal for replacement · more· less
The oil pan gasket on the N55 can develop leaks over time. This repair is expensive because the front subframe must be partially lowered to access the oil pan, significantly increasing labor time to 6-8 hours. The gasket itself is inexpensive, but labor at a BMW dealer typically runs €1,200-1,800. Independent specialists may charge €900-1,300. The leak usually develops gradually and can be monitored for a while. It typically appears above 120,000 km and is more common on cars driven predominantly in urban conditions with frequent thermal cycling.
VANOS solenoid wear
€300 - 7006 of 6
Variable valve timing solenoids wear or become contaminated with oil residue · more· less
The N55 has two VANOS (variable valve timing) solenoids that control intake and exhaust cam timing. These solenoids can fail from normal wear or become clogged with oil deposits, particularly if oil change intervals are extended. Symptoms include rough idle, hesitation under acceleration, reduced power, and VANOS-related fault codes. Each solenoid costs approximately €100-150, and replacement is a relatively straightforward 1-2 hour job. Total cost is €300-700 depending on whether one or both solenoids are replaced and the workshop rate. Regular oil changes with high-quality oil help prevent premature contamination.
Robust N55 base, but the Alpina twin-turbo hardware adds cost exposure
The B3 Biturbo's N55 inline-six is well-proven and shares its core architecture with hundreds of thousands of BMW 335i engines. Known issues such as the valve cover, water pump, and oil filter housing gasket are well-documented and straightforward to diagnose. The main cost differentiator is Alpina's twin-turbo installation: two turbochargers instead of one, on Alpina-specific hardware that is significantly more expensive to service or replace than the single standard N55 turbocharger. Low production volume means some Alpina-specific parts require ordering rather than off-the-shelf availability. Regular oil changes with quality oil and prompt attention to warning signs are the most effective preventive measures.
Service history
Complete BMW dealer or Alpina specialist records essential. Verify oil changes at or below BMW's recommended intervals.
Tires and wheels
Check tread depth, tire age (date codes), and condition of the Alpina classic alloy wheels. Kerb damage on the 20-inch rims is common and expensive to repair.
Cold start
Start the engine completely cold. Listen for unusual turbo whine, rattles, or rough idle in the first 30 seconds.
Test drive
Minimum 30 minutes including sustained highway speeds to bring the turbo system fully up to temperature.
Specific for this vehicle
Check for oil leaks around valve cover and oil filter housing
Look for oil residue on the front and sides of the engine. A burning oil smell after a test drive often indicates a valve cover or OFHG leak.
Monitor coolant level and inspect for water pump issues
Low coolant or a history of overheating events may indicate a failing electric water pump. Check for coolant traces around the pump area.
Assess turbo response under full load
During the test drive, check for consistent boost delivery. Any hesitation, reduced power, or unusual whistling under load could indicate wastegate or bearing wear on either of the two turbochargers.
+ 3 more checksShow less
Check condition of Alpina-specific decals and trim
Faded or peeling Alpina pinstripes and interior badging are expensive to replace through official channels. Factor cosmetic restoration into the purchase price.
Check both airbag campaigns with the VIN
Safety Gate alert A12/02834/24 (campaigns 0032550300, 0032560300, 0032570300) covers only cars that received a Takata airbag when they were converted to a Sport or M Sport steering wheel, so it is not automatic on every car. Alert A12/02967/24 (campaign 0032620300) applies to B3 and B3 S Bi-Turbo Touring cars produced between 2 January 2016 and 12 December 2017. Give BMW the VIN and ask about both.
Confirm ZF transmission fluid has been changed
ZF publishes a 150,000 km fluid change for its 8HP gearboxes, and a shorter interval where the car sees high loads or high temperatures or its history is unknown, which fits most B3s. BMW treats the fill as lifetime, so ask for an invoice rather than assuming. Dark or burnt-smelling fluid indicates neglect.
Recalls and Technical Service Bulletins
Takata airbag inflator, Safety Gate alert A12/02834/24 (campaigns 0032550300/0032560300/0032570300). Applies only to cars fitted with a Takata airbag when converted to a Sport or M Sport steering wheelVerify with VIN
Airbag, Safety Gate alert A12/02967/24 (campaign 0032620300). B3 and B3 S Bi-Turbo Touring produced 2 January 2016 to 12 December 2017Critical - verify completed
Contact a BMW dealer with the VIN to verify all recall work has been completed. Alpina cars share BMW's recall campaigns where they use the same components, and the Touring airbag campaign was issued for the Alpina cars specifically.
Warranty Status
Factory warranty (2 years, 3 years in Germany from Nov 2016)Expired on all used B3 F30 models
Extended warrantyAvailable through BMW dealers, terms vary
Rust perforation warranty (12 years)May still apply to 2014+ cars
All F30 B3 models are outside their original factory warranty. Alpina cars were warranted through the BMW dealer network under BMW's standard terms. Extended warranty coverage is available through BMW dealers but may exclude some Alpina-specific components.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
