See here for the instruction sheet and below for the maintenance schedule

Spark Plug – Malibu M5 and M6 Engine Application

The E100158 is a high-quality iridium spark plug designed for reliable performance and longevity, making it an excellent choice for Malibu boat engines, specifically the M5 and M6 Monsoon engines.

Why Choose These for Malibu M5 and M6 Engines:

• Optimal Performance: The fine-wire iridium electrode provides consistent, efficient ignition, which is crucial for the high-performance demands of the M5 and M6 engines.

• Durability: Designed to withstand high temperatures and pressures typical of these powerful marine engines.

• Marine Suitability: Coated to resist corrosion and fouling, which is essential in marine environments.

• Extended Service Life: This reduces maintenance with a lifespan often exceeding 100,000 miles in automotive equivalents.

Compatible Malibu Boat Models:

• Boats equipped with Malibu M5 Monsoon V8

• Boats equipped with Malibu M6 Monsoon V8

Installation Tips:

• Follow Malibus torque specifications and use anti-seize on threads to prevent sticking.

• Check the gap before installation (typically pre-gapped for standard use).