NRW-Design BMW S65 / S85 Billet Aluminum Spark Plug Tubes Set

Product Information

The NRW-Design Billet Aluminum Spark Plug Tube Kit is a permanent, direct-fit upgrade for the aging factory plastic spark plug tubes used on BMW S65 V8 and S85 V10 engines.

The spark plug tubes seal the openings between the valve covers and cylinder heads, helping prevent engine oil from entering the spark plug wells. Over time, the original plastic tubes can become brittle, distorted, cracked or loose after repeated exposure to engine heat, potentially allowing oil to collect around the ignition coils and spark plugs.

Each NRW-Design replacement tube is CNC-machined from solid 6061-T6 billet aluminum for superior strength, dimensional stability and long-term durability. Unlike the original plastic components, the billet tubes resist deformation and maintain a consistent sealing surface in demanding street, track and motorsport environments.

An anodized finish provides additional protection against heat, oxidation and corrosion. The tubes are compatible with original BMW valve-cover gaskets and NRW-Design valve-cover gasket solutions, allowing them to be installed during routine valve-cover service or a complete engine reseal.

• Available for BMW S65 V8 and S85 V10 engines
• Direct replacement for the original plastic spark plug tubes
• CNC-machined from solid 6061-T6 billet aluminum
• Anodized for heat, oxidation and corrosion resistance
• Designed to prevent oil seepage into the spark plug wells
• Maintains a secure and consistent sealing surface
• Resists cracking, deformation and loosening
• Suitable for street, track and motorsport applications
• Compatible with original BMW valve-cover gaskets
• Compatible with NRW-Design valve-cover gaskets
• Supplied as a complete engine set
• Made in the United States by NRW-Design

Vehicle and Engine Applications

• S65SPTK: BMW E90 M3 Sedan, E92 M3 Coupe and E93 M3 Convertible equipped with the S65 V8 engine
• S85SPTK: BMW E60 M5 Sedan, E61 M5 Touring, E63 M6 Coupe and E64 M6 Convertible equipped with the S85 V10 engine

Spark Plug Tube Failure Symptoms

• Engine oil collecting inside one or more spark plug wells
• Oil contamination around the ignition coils or spark plugs
• Visible cracking, distortion or deterioration of the factory plastic tubes
• Ignition misfires caused by oil-contaminated coils or spark plugs
• Rough idle or inconsistent engine operation
• Burning-oil odor after oil escapes from the valve-cover area
• Repeated spark plug well leakage after valve-cover gasket service

Installation

The billet spark plug tubes install in place of the original plastic components beneath the valve covers. Installation requires removal of the corresponding valve covers and should be completed together with inspection or replacement of the surrounding valve-cover gaskets and seals.

Professional installation is recommended to ensure that every tube is fully seated, correctly aligned and properly sealed. All spark plug wells should be cleaned and inspected before the ignition coils and spark plugs are reinstalled.

Important Notes

• Select the correct S65SPTK or S85SPTK configuration before ordering.
• The S65 kit includes eight billet aluminum spark plug tubes.
• The S85 kit includes ten billet aluminum spark plug tubes.
• Each configuration is sold as one complete engine set.
• Valve-cover gaskets, spark plugs, ignition coils and additional installation components are not included unless otherwise specified.
• Inspect the valve covers, gaskets, ignition coils and spark plug wells during installation and replace worn or damaged components as required.
• Professional installation is recommended.