A Guide to Spark Plug Replacement for the 2006-2015 BMW 750Li
Keep your V8 running smoothly by understanding when and how to replace your spark plugs.
- The 2006-2008 (N62) and 2009-2015 (N63) models use different engines and require different tools and service intervals.
- For the turbocharged N63 engine, use a shorter replacement interval of around 37,000 miles to maintain performance.
- Stick with OEM-equivalent brands like NGK and Bosch for proven reliability and performance.
- If misfires persist after replacing plugs on an N63 engine, suspect a failing fuel injector, which is a known issue.
Understanding Spark Plugs in Your 750Li
Replacing the spark plugs in your 2006-2015 BMW 750Li is a key maintenance item that directly impacts engine health and performance. However, this model range covers two different generations with two very different V8 engines, which changes the job significantly.
- 2006-2008 750Li (E66 chassis): These models use the naturally-aspirated N62 engine. Spark plug replacement is more straightforward on this engine.
- 2009-2015 750Li (F02 chassis): These models are equipped with the twin-turbocharged N63 engine. The turbochargers are located in the 'V' of the engine, creating more heat and making service more complex.
Symptoms of Failing Spark Plugs
When your spark plugs are worn, your 750Li will give you clear signs. Ignoring them can lead to more significant issues, like damage to the catalytic converters from unburned fuel. Look out for:
- Rough Idle: The engine may shake or vibrate noticeably when stopped.
- Engine Misfires: You might feel a hesitation, stutter, or "hiccup" during acceleration. A flashing check engine light is a sure sign of a misfire.
- Reduced Power: The car will feel sluggish and slow to accelerate.
- Poor Fuel Economy: Worn plugs can cause fuel consumption to increase by up to 30%.
- Trouble Starting: The engine may take longer to crank over before starting.
A Note on N63 Engine Issues
For 2009-2015 models with the N63 engine, misfire symptoms can also be caused by failing fuel injectors, a known issue with these engines. If you replace your spark plugs and coils but the misfire remains on the same cylinder, the fuel injector is the next most likely culprit. A diagnostic scan is highly recommended before starting work.
Choosing the Right Aftermarket Spark Plugs
For BMWs, sticking with the Original Equipment Manufacturer (OEM) brands is a safe and reliable choice. The original spark plugs installed at the factory are made by either NGK or Bosch. You can buy the same high-quality plug without the BMW logo on the box, often for a lower price.
- Tier 1 (OEM Equivalent): NGK and Bosch are the proven choices for the 750Li. They are engineered specifically for the demands of these engines. Many owners and technicians use them exclusively.
- Tier 2 (Reputable Aftermarket): Denso and Champion also produce quality spark plugs that are compatible with the 750Li. While less commonly discussed in BMW forums, they are established brands.
- Tier 3 (Budget): Brands like Autolite are generally not recommended or used for these high-performance German engines, as they may not meet the specific heat range and durability requirements.
OEM vs. Aftermarket Quality
There is no verifiable quality difference between a spark plug from a BMW dealer and the same part number from NGK or Bosch. You are paying extra for the BMW branding. Save money by purchasing the direct OEM-equivalent part.
Cost of New Aftermarket Spark Plugs (2006-2015 BMW 750Li)
| Brand Tier | Price Range (per plug) |
|---|---|
| Tier 1 (NGK, Bosch) | $12 - $30 |
| Tier 2 (Denso, Champion) | $8 - $20 |
| Tier 3 (Budget Brands) | $4 - $10 |
Note: Prices are estimates and can vary based on the supplier. Your 750Li requires eight spark plugs.
Frequently Asked Questions
How often should I replace the spark plugs on my 750Li?
It depends on your engine. For the N62 engine (2006-2008), a replacement interval of 60,000 miles is common. For the turbocharged N63 engine (2009-2015), the interval is much shorter; BMW recommends replacement as early as every 37,000 miles due to the higher stress from turbocharging.
Do I need special tools to change the spark plugs?
Yes. The N62 engine (2006-2008) requires a thin-wall 16mm (5/8") spark plug socket. The N63 engine (2009-2015) requires a special 14mm 12-point thin-wall swivel socket. A torque wrench is mandatory for both to avoid damaging the engine.
Should I gap the new spark plugs?
No. Modern platinum and iridium spark plugs from brands like NGK and Bosch come pre-gapped from the factory. Attempting to adjust the gap on these fine-wire plugs can easily damage the delicate electrode, leading to misfires.
Should I replace the ignition coils at the same time?
It is not required, but it is a common preventative measure. The ignition coils sit directly on top of the spark plugs and must be removed for the job anyway. If your vehicle has high mileage or you are already experiencing misfires, replacing the coils along with the plugs can save you from having to do the job twice.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12120037582 12122158253 12120034098
The 2006-2008 750Li (N62) typically uses a 16mm hex plug. The 2009-2015 750Li (N63) uses a 14mm 12-point plug. Both are typically iridium or platinum fine-wire plugs. Always verify the correct part number for your specific vehicle before purchasing.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- BMW 750Li:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding Spark Plugs in Your 750Li
- Symptoms of Failing Spark Plugs
- A Note on N63 Engine Issues
- Choosing the Right Aftermarket Spark Plugs
- OEM vs. Aftermarket Quality
- Cost of New Aftermarket Spark Plugs (2006-2015 BMW 750Li)
- Frequently Asked Questions
- 🎟️ Get 5% Off