Six spark plugs.
The 2009 BMW 328i uses a 3.0-liter inline-6 engine (N52 family) with six cylinders, so there is one spark plug per cylinder and one ignition coil per cylinder in a coil-on-plug setup. This means the total number of spark plugs in this model is six.
Spark plugs and ignition system: a quick breakdown
Below is a concise breakdown of the engine's ignition layout and what it implies for maintenance and replacement schedules.
- Six spark plugs, one in each cylinder.
- Six ignition coils, one per cylinder (coil-on-plug design).
- Engine configuration: 3.0-liter inline-6 (N52), which uses six cylinders.
- Plug replacement intervals vary by plug type and driving conditions; common ranges are roughly 60,000 miles for copper plugs and up to 100,000 miles for iridium or platinum variants.
In short, the 2009 328i's six-cylinder layout is matched by six spark plugs and six ignition coils.
Maintenance considerations
When planning service, refer to the owner's manual or a BMW service bulletin for the exact replacement interval based on the plug type installed. Replacing all six plugs and coils at the same time is common practice to maintain balanced ignition performance across all cylinders.
Summary
The 2009 BMW 328i has six spark plugs—one for each of its six cylinders—paired with six ignition coils in a coil-on-plug arrangement on the N52 inline-6 engine. Regular checks and timely replacement (according to plug type and mileage) help preserve engine efficiency and performance.
Why are used 328i so cheap?
What Are Used 328i So Cheap? BMWs have a high repair cost, making them hard to maintain for many people looking for a reliable, used vehicle. The used BMW market is also heavily saturated, making it harder to keep resale values up.
What oil is best for a BMW 328i?
5W-30
So, what type of oil is recommended for the BMW 328i? The Pacific BMW service team in Glendale recommends that you use synthetic oil with a grade of 5W-30. We've got more information on why this is important in the guide below.
What kills spark plugs quickly?
Pre-ignition can lead to heat building up in the combustion chamber causing the spark plugs to fail. In addition, if the cooling system isn't functioning correctly, it can cause the engine and spark plugs to overheat. This overheating can lead to the spark plug's electrode wearing out faster.
How many spark plugs are in a BMW 328i?
2015 BMW 328i Spark Plugs
There is one 2015 BMW 328i spark plug for each engine cylinder, and this part is responsible for kickstarting combustion in each of the cylinders to power the car. Keep your vehicle running right with any of the 2015 328i spark plugs we carry from trusted brands.