Iridium Platinum Spark Plugs for Mercedes V8 4.7L & 5.5L - Pack of 8

Our review of these A-Premium iridium platinum spark plugs finds them best suited for owners of Mercedes-Benz V8 models who want a durable, OEM-style replacement without paying dealer prices. The bottom line: these plugs deliver quiet, consistent ignition and a solid fit for 4.7L and 5.5L engines, making them a practical choice for routine maintenance or pre-trip replacement. Installation is straightforward and customers report they fit exactly and improve engine smoothness, so the main reason to buy is dependable performance and longevity aligned with OEM specs.

Key Features

• Vehicle Fitment: Direct compatibility with a wide range of Mercedes V8 models ensures correct fit and avoids cross-threading or mismatch problems.
• Electrode Materials: Iridium tip and platinum core are engineered to provide reliable ignitability and longer service life compared with standard plugs.
• Precise Gap: The factory gap of 0.032 in preserves ignition timing and helps maintain steady combustion under normal driving conditions.
• OEM Reference Numbers: Supplied with common reference numbers used by manufacturers to help confirm proper replacement for specific Mercedes engines.
• Long Service Interval: Designed for longevity with recommended replacement intervals around 80,000 to 100,000 miles, reducing routine maintenance frequency.

Who It's For

This set is ideal for Mercedes owners with CL550, CLK550, CLS550, E550, G550, GL450, GL550, ML550, R550, S450, S550, or SL550 models from the late 2000s through early 2010s who want a plug that matches OEM design and tolerances. Mechanics and DIYers who value easy installation and correct thread reach will appreciate the consistent fit and the included specification details.

Drivers with higher-performance tuning, modified ignition systems, or nonstandard fuel/boost setups should look elsewhere for specialty plugs designed specifically for extreme conditions. Also, owners of non-Mercedes or different-displacement engines must verify fitment before purchase.

Pros & Cons

Pros

• Good fit for specified Mercedes V8 models, with customers reporting straightforward installation and correct seating.
• Iridium tip and platinum core deliver improved ignitability and extended life versus standard copper plugs.
• Offers clear value for money with OEM-like specs and long recommended intervals between replacements.

Cons

• Not intended for heavily modified engines or racing applications where specialty spark plugs may be required.
• Resistance rating and materials are fixed to the supplied spec, so users needing alternate resistance values must confirm compatibility first.

Specifications

Reference Numbers	93911, LKR7AIX, XP5702, 08040K9000, BY480LKR7A, SAB330NG1709
Center Electrode Tip	Iridium
Center Electrode Core	Platinum
Resistance	5000 ohms
Gap Size	0.032 in
Reach	26.5 mm
Thread Diameter	12.00 mm

Our Verdict

These iridium platinum spark plugs represent a pragmatic replacement for Mercedes-Benz 4.7L and 5.5L V8 engines, offering OEM-style fit, improved ignitability, and long service life at a competitive price. Owners seeking reliable daily-driving performance and fewer replace intervals will find them a sensible value; those with modified engines should select specification-matched specialty plugs instead.

Frequently Asked Questions

Will these fit my 2009 GL450?
Yes, the plugs list compatibility with GL450 X164 2007-2012 4.7L V8 and are designed with the correct thread and reach for that engine.

How long do these spark plugs typically last?
They use iridium and platinum construction and are engineered for longevity, with recommended replacement intervals around 80,000 to 100,000 miles under normal driving conditions.

Are these easy for a DIY installation?
Customers report the plugs are easy to install and fit perfectly, but correct torque and anti-seize procedures should be followed to avoid damage.