The BMW N54 is a 3.0-liter twin-turbocharged direct-injection inline-6 that debuted in 2006 and became one of the most celebrated tuner engines ever built. From the factory it made 300hp at just 8 PSI — with forged internals from the factory. That's why a simple ECU flash turns it into a 380hp weapon, and why built examples routinely push 700whp+.

The N54 is not without its problems. It leaks oil from almost every seal. The HPFP can fail without warning. The plastic charge pipe will blow off under boost. The wastegate rattles. Carbon builds up on the intake valves. But every single one of these problems is well documented, well understood, and fixable. That's what this page is for.

If you maintain it right and build it smart — the N54 is one of the best performance platforms on the road.

Click any failure to expand the full diagnosis, fix, and part numbers.