Bosch 8508 Spark Plug

Bosch EVO Spark Plug for Modern Engines

Bosch EVO spark plug Part Number 8508 is built for modern gasoline engines that demand stable ignition under high cylinder pressure and heat. It is engineered for direct-injection and turbocharged applications, including select Chevrolet Trax, Buick Encore GX, Chevrolet Equinox, and GMC Terrain fitments.

The Bosch EVO line focuses on long service life and dependable ignition performance in demanding operating conditions. With an improved insulator design and high dielectric strength, this spark plug is built to resist irregular combustion events in advanced engine designs.

Key Features

• Bosch EVO spark plug, Part Number 8508
• Iridium center electrode tip with fine-wire design for consistent spark delivery
• Platinum ground electrode tip material with J-gap configuration
• High dielectric strength rated above 45 kV
• Resistor type spark plug with 6000 resistance
• Tapered seat and projected insulator design
• 12 mm thread diameter, 14 mm hex size, 25 mm reach
• Pre-gapped at .7 for specified applications

Product Details

Bosch EVO spark plugs are developed to meet the demands of modern turbocharged gasoline direct injection engines. The copper core construction supports heat transfer, while the iridium center electrode tip and platinum ground tip help maintain reliable ignition performance over a long service interval. The ceramic insulator and projected design are intended to handle the combustion stresses found in newer engine platforms. This Bosch EVO spark plug Part Number 8508 is a direct-fit ignition component for select Buick, Chevrolet, Cadillac, and GMC applications, including 2016-2024 Chevrolet Malibu, 2018-2024 Chevrolet Equinox, and 2018-2024 GMC Terrain.

This part cross-references no listed aftermarket part numbers for the same application.

What It Helps Address

• Misfires caused by worn or heat-stressed spark plugs
• Hard starting from weak or inconsistent ignition
• Rough idle and hesitation under load
• Combustion instability in turbocharged direct-injection engines
• Reduced ignition consistency as plugs age

Installation Notes

Verify engine code and OE spark plug specification before installation. Confirm the 12 mm thread diameter, 25 mm reach, tapered seat, and .7 pre-gap match the vehicle requirement. Use proper spark plug service procedures to avoid thread damage and ensure correct torque. For fitment, this Bosch EVO spark plug Part Number 8508 fits 2024-2025 Buick Envista, 2024-2025 Chevrolet Trax, 2020-2024 Buick Encore GX, 2020-2024 Cadillac CT5, 2018-2024 Chevrolet Equinox, 2016-2024 Chevrolet Malibu, 2021-2024 Chevrolet Trailblazer, 2018-2024 GMC Terrain, 2021-2022 Buick Encore, 2016-2019 Buick Encore, 2016-2019 Buick Cascada, 2016-2019 Cadillac CT6, and 2016-2019 Chevrolet Cruze.

Quality Assurance

Bosch develops and produces EVO spark plugs to OE-level quality standards for modern ignition systems. The design is intended to deliver reliable ignition performance throughout a long service life in demanding engine conditions.