The 2007 BMW 328i (E90) is powered by the N52 3.0-liter inline-six. Understanding the spark plugs helps with maintenance, performance, and reliability.
In brief, the 2007 328i uses six long-life spark plugs designed for the N52 engine. They are typically iridium- or platinum-tipped plugs and should be replaced with OEM or equivalent long-life plugs from reputable brands.
More detail: This article explains the engine, the recommended plug types, how to choose between OEM and aftermarket options, and practical replacement tips.
Engine and spark plug technology
The N52 engine family uses a compact spark plug design with six plugs in-line. The plugs are selected to balance durability and firing efficiency for a smooth idle and steady power delivery. OEMs typically specify long-life plugs to reduce maintenance intervals, commonly using iridium- or platinum-tipped electrodes. When shopping, you will see plugs marketed as "iridium IX" or "platinum-tipped"—the key is to match the plug's heat range and gap to the N52’s specification for your vehicle and climate.
Replacement options for the N52 engine
There are several widely used categories of spark plugs that fit the N52 engine in a 2007 328i. Before making a purchase, verify compatibility with your VIN and engine code. The main options are:
- OEM-equivalent plugs: BMW Genuine Parts or dealer-supplied plugs designed for the N52, typically offering optimal performance and durability.
- Aftermarket long-life plugs: Reputable brands such as NGK and Bosch offer iridium- or platinum-tipped plugs specifically tuned for BMW engines and the N52 family.
- Quality universal plugs: Some universal plugs are marketed as compatible with many 3.0L inline-sixes, but you should confirm heat range and fitment for the N52 before using them.
In each case, choose a plug with the correct heat range and gap for the N52 engine, and avoid copper-core plugs which generally wear faster in modern engines.
Maintenance tips and replacement schedule
To maximize durability and performance, follow a regular replacement schedule and proper installation procedure. For the N52 and 2007 328i, typical recommendations are to inspect and replace the six plugs roughly every 60,000 miles under normal driving; in harsher conditions or high-performance driving, replacement sooner may be advised. Always use a torque wrench and the recommended torque spec for spark plugs, and consider replacing the valve cover gasket if it shows wear.
Before replacing, gather the correct tools, confirm the plug type, gaps, and torque values from the service manual or a trusted parts retailer, and consider replacing the ignition coils if testing shows weakness, as misfires can sometimes be traced to aging coils in addition to worn plugs.
Summary
The 2007 BMW 328i uses six long-life spark plugs designed for the N52 3.0L inline-six. You’ll generally choose between BMW OEM (or equivalent) long-life plugs and reputable aftermarket iridium/platinum options, ensuring correct heat range and gap. Following the recommended replacement intervals and proper installation will help maintain performance and reliability.