Bosch 8508 Spark Plug

Reliable Ignition Performance for Buick, Cadillac, Chevrolet, and GMC

The Bosch EVO 8508 spark plug is engineered to deliver consistent ignition performance for a range of 4-cycle engines. Designed specifically for vehicles like the Buick Encore GX, Cadillac CT5, Chevrolet Equinox, and GMC Terrain, this spark plug ensures efficient combustion and reliable starts.

• Part Number: 8508
• Brand Line: Bosch EVO
• Resistance: 6000 ohms for noise suppression
• Center Electrode Tip Material: Iridium for durability
• Ground Electrode Tip Material: Platinum for enhanced wear resistance
• Ground Configuration: J-gap with a single ground electrode
• Pre-Gap Size: 0.7 mm for optimal spark
• Thread Diameter: 12 mm with 25 mm reach
• Hex Size: 14 mm with non-removable nut terminal
• Insulator Material: Ceramic with projected insulator type
• Manufacturer Heat Range: 5 with tapered seat type

Detailed Bosch EVO Spark Plug Features

The Bosch EVO 8508 spark plug incorporates a fine wire center electrode made of iridium, which provides excellent ignition reliability and longevity. The copper core in both the center and ground electrodes enhances thermal conductivity, helping to dissipate heat effectively. The ground electrode features a platinum tip and a standard design with a J-gap configuration, which supports stable spark generation and reduces electrode wear. The spark plug includes a built-in resistor with 6000 ohms resistance to minimize electromagnetic interference, ensuring smooth operation of vehicle electronics.

The ceramic insulator with a projected design improves voltage insulation and heat resistance, while the tapered seat ensures a secure fit in the combustion chamber. The 14 mm hex size and non-removable nut electrical terminal type facilitate straightforward installation and reliable electrical connection.

Compatible Vehicles and Applications

This Bosch EVO 8508 spark plug is compatible with a variety of Buick, Cadillac, Chevrolet, and GMC models, including:

• Buick Encore and Encore GX
• Cadillac CT5 and CT6
• Chevrolet Cascada, Cruze, Equinox, Malibu, Trailblazer, Trax
• GMC Terrain
• Chevrolet Envista

It is designed for 4-cycle engines requiring a 12 mm thread diameter and a heat range of 5.

Common Issues Addressed by Bosch EVO 8508 Spark Plug

• Engine misfires and rough idling
• Poor fuel efficiency due to incomplete combustion
• Difficulty starting the engine in cold conditions
• Reduced engine power and acceleration
• Excessive electrode wear leading to ignition failure

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.7 mm as specified. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque to avoid damage to the tapered seat. The 14 mm hex size allows for standard spark plug socket use. Ensure the ignition system is off and the engine is cool before replacing spark plugs to prevent injury or damage.

Quality Assurance and Warranty

Bosch manufactures the EVO 8508 spark plug to meet strict quality standards, using premium materials such as iridium and platinum for electrode tips. The resistor built into the spark plug helps protect vehicle electronics from interference. While specific warranty details are not provided here, Bosch products typically come with manufacturer-backed quality assurance to support reliable performance.