The BMW N55 is a turbocharged straight-six petrol (gasoline) engine that began production in 2009. The N55 replaced the BMW N54 engine and was introduced in the F07 5 Series Gran Turismo. The N55 was BMW 's first straight-six engine to use a twin-scroll turbocharger. It also won three straight Ward's 10 Best Engines awards in 2011–2013. [1]

Mar 28, 2025 · The N55 was a staple in BMW's engine lineup for over ten years with several different variations. Read along to see how the turbocharged engines tick.

Jan 7, 2023 · In this ultimate guide, we cover the 3.0L turbocharged inline 6 BMW N55 engine. Learn about N55 specs, modifications, and reliability.

Jul 23, 2024 · BMW’s N55 engine is a 3.0L inline-6 turbocharged, direct injection gasoline engine produced from 2009-present. The N55 was a big generational leap for BMW turbocharged engines and it introduced some very important elements to future engine generations.

Dec 12, 2023 · The N55 engine is a 3.0-liter inline-six turbocharged engine that produces from 300 horsepower to 445 horsepower in ALPINA models. It is used in various models of BMW, such as the 1 Series, 3...

Apr 23, 2024 · I’ve done this job myself several times (X3 35i with N55 with 175k miles and 2014 335i with 82k). Don’t use the Elring gasket between the housing and the oil thermostat housing as I’ve had it leak when the BMW one doesn’t.

Dec 26, 2023 · BMW's N55 is a reliable engine capable of much more power than it was given. Here are a few of the best ways to boost your engine's performance & reliability.

Jan 17, 2025 · The N55 motor has a reputation for having issues with valve cover gaskets, spark plugs/coil packs and water pumps. The notorious issue with this engine is the Oil Filter Housing Gasket (OFHG). Researching on forums reveals that some engines have seized up several miles after OFHG replacement.

Sep 19, 2020 · To cover some basic information, the BMW N55 is an all-aluminum 3.0L straight-six engine with dual overhead cams, variable valve timing, and variable valve lift. Bore measures at 84mm and stroke at 89.6mm.

Feb 25, 2025 · The N55 engine produces up to 335 hp and 332 lb-ft of torque, as confirmed by BMW USA and various automotive publications such as Car and Driver. Independent tests conducted by MotorTrend have validated the 0-60 mph times of approximately 5.0 seconds for models like the 335i and 135i.