The single-turbo successor to the N54, generally more refined with fewer major faults but still a few to watch for.
The N55 is a single twin-scroll turbocharged 3.0-litre inline-six that succeeded the N54 across BMW's six-cylinder range through the 2010s.
A worn gasket at the oil filter housing is a common leak point.
Solenoid wear causes rough idle and a rattle on start-up.
A less pronounced version of the N54's wastegate rattle can still occur under light throttle.
A failed CCV valve can trigger vacuum-related fault codes and rough idle.
Routine oil changes and prompt attention to any rattle or rough idle keep the N55 running reliably long-term.
Full BMW-specific diagnostic scan to identify the exact source of the issue rather than guessing.
Checking known leak points, wear items and service history against the N55's specific weak spots.
Confirming any rattle, misfire, or rough-running symptoms under real driving conditions.
Oil filter housing gasket leaks and VANOS solenoid wear are the most common N55 issues we see.
The N55 was used in 3 Series (335i, F30), 1 Series (135i, F20/F21), 5 Series (535i, F10), X3/X4 (35i) and M2 (F87).
Considered one of BMW's more dependable modern turbo engines, with fewer major issues than the N54.
Book a diagnostic with our BMW-trained technicians in Merrimu — serving Melton, Bacchus Marsh, and Melbourne's western suburbs.
