Features single twin-scroll turbocharger instead of dual
Uses cast iron crankshaft and rods instead of forged ones
Includes VANOS variable valve timing system with 15° intake and 10° exhaust adjustment
Engine Versions
N55B30M0 produces 302hp at 5,700-5,800rpm
N55B30 delivers 315hp at 4,505-6,000rpm
N55B3000 produces 322hp between 4,505-6,000rpm
N55HP delivers 335hp from 4,505-6,000rpm
N55B30T0 produces 365hp at 6,500rpm
Common Issues
Valve cover oil leaks can occur due to high temperatures
VANOS solenoid failure affects engine performance
Water pump failure is common across BMW models
Oil filter housing gasket leaks can damage engine components
High pressure fuel pump issues affect early 2010-2011 models
Reliability
Generally considered BMW's most dependable turbocharged engine
Can be tuned to produce up to 400whp
Reliability depends on maintenance and vehicle condition
Repair costs can increase with frequent service
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