2025 Mercedes-Benz Sprinter Spark Plug Specifications

As of my last update, detailed specifications for the 2025 Mercedes-Benz Sprinter are still being released. The information below is based on the most recent available data for the latest Sprinter models, which are equipped with gasoline engines.

Quick Reference: Spark Plug Specifications

Note: Always verify the part number and specifications with your vehicle's VIN before purchasing parts or beginning work. Specifications can change based on the specific engine version and emissions equipment.

Why the Right Plug Matters

Using the correct spark plug is critical for engine performance, fuel economy, and longevity. The engineers who designed your Sprinter's engine selected a specific plug for several reasons:

• Heat Range: This refers to the plug's ability to transfer heat away from the combustion chamber. A plug that is too "hot" can lead to pre-ignition (detonation), causing severe engine damage. A plug that is too "cold" can foul with carbon deposits, leading to misfires. The factory-specified plug has the optimal heat range for all operating conditions.
• Electrode Material: Modern engines, like the one in your Sprinter, use long-life spark plugs with fine-wire electrodes made of precious metals.
  • Iridium: This is the most common material for modern OEM plugs. It has an extremely high melting point and offers superior durability and performance. Iridium plugs, like those specified for the Sprinter, can last up to 100,000 miles, providing a consistent, strong spark throughout their life.
  • Platinum: Another excellent long-life material, often used in performance applications. Platinum plugs offer a similar lifespan to iridium.
  • Copper: While once the standard, copper plugs have a much shorter lifespan (typically 20,000-30,000 miles). They are not suitable for modern high-energy ignition systems like the coil-on-plug setup in the Sprinter, as the powerful spark would erode the larger copper electrode very quickly.

How to Gap a Spark Plug

Even when you buy pre-gapped plugs, it's essential to verify the gap before installation. Plugs can be easily dropped or mishandled during shipping, which can close the gap.

1. Use the Right Tool: A feeler gauge or a ramp-style gapper is necessary. For fine-wire iridium plugs, a wire-style feeler gauge is preferred to avoid damaging the delicate electrode.
2. Measure Carefully: Slide the correct thickness gauge between the center and ground electrodes. It should slide through with slight drag, like a knife through cold butter. If it's too loose or doesn't fit, the gap needs adjustment.
3. Adjust Gently: To adjust, never pry against the center electrode. Instead, gently bend the ground electrode (the L-shaped piece) towards or away from the center electrode using the adjustment tool on your gapper or a pair of needle-nose pliers on the far end of the strap. Re-measure until the gap is perfect.

Replacement Procedure Tips

The 2.0L gasoline engine in the Sprinter uses a modern coil-on-plug (COP) ignition system. This means each spark plug has its own ignition coil sitting directly on top of it, eliminating the need for a distributor and spark plug wires.

• Coil-on-Plug Removal: After removing the engine cover, you will see the ignition coils. Disconnect the electrical connector from each coil, then unbolt the single hold-down bolt (usually a 10mm or Torx head). The coil can then be gently twisted and pulled straight up to remove it from the spark plug.
• The Anti-Seize Debate: Historically, technicians applied anti-seize compound to spark plug threads to prevent them from seizing in the aluminum cylinder head. However, modern plug manufacturers like NGK apply a special trivalent plating to their plugs that provides the same anti-seize properties and prevents corrosion. Applying additional anti-seize can act as a lubricant, leading you to over-torque the plug and potentially damage the threads in the cylinder head. It is generally recommended to install modern plated plugs clean and dry, without any added anti-seize.
• Dielectric Grease: It is highly recommended to apply a small amount of dielectric grease to the inside of the spark plug boot (the end of the ignition coil that sits on the plug). This grease does not conduct electricity; it seals out moisture and prevents the boot from sticking to the porcelain of the spark plug, making future removal much easier.

Known Issues

At present, there are no widespread, well-documented issues with spark plug replacement on the modern Mercedes-Benz Sprinter 2.0L gasoline engine, such as the infamous breakage of Ford's two-piece plugs or other design flaws. The procedure is straightforward for a modern engine, provided the correct torque is applied and the plugs are handled with care.

Need plugs replaced? Find a shop on Repairius.