Bosch 8118 Spark Plug

Overview of Bosch OE Fine Wire Double Platinum Spark Plug 8118

The Bosch OE Fine Wire Double Platinum Spark Plug 8118 is engineered for reliable ignition performance in a range of Chrysler, Dodge, Jeep, Plymouth, and Saab vehicles. Designed with precision materials and specifications, this spark plug supports efficient combustion and consistent engine operation.

• Double platinum electrodes for enhanced durability and consistent spark
• 6000 ohm resistor to reduce electrical interference
• Standard ground electrode tip and configuration for reliable ignition
• 1.1 mm pre-gap size optimized for 4-cycle engines
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Ceramic projected insulator for improved heat resistance
• Hex size of 20.8 mm for standard installation tools
• Manufacturer heat range rating of 8 for balanced thermal performance

Detailed Product Features and Specifications

This Bosch spark plug features a center electrode tip made of platinum, combined with a nickel-yttrium and copper core material to ensure stable conductivity and longevity. The ground electrode tip also uses platinum and nickel-yttrium, providing enhanced wear resistance. The spark plug’s ceramic insulator is projected to improve heat dissipation and prevent fouling. With a resistance of 6000 ohms, it effectively suppresses radio frequency interference, protecting vehicle electronics. The flat seat design and 19 mm reach make it compatible with many OEM engine configurations, particularly in Chrysler, Dodge, Jeep, Plymouth, and Saab models.

About the OE Fine Wire Double Platinum Brand Line

The Bosch OE Fine Wire Double Platinum line is designed to meet or exceed original equipment specifications by using fine wire electrodes with double platinum construction. This design improves spark efficiency and extends service life compared to conventional spark plugs. The 8118 part number is part of this line, offering a balance of durability and performance for 4-cycle engines commonly found in the specified vehicle makes and models.

Compatible Vehicles and Common Applications

• Chrysler models including Concorde, Intrepid, and Town & Country
• Dodge vehicles such as Caravan, Dakota, and Ram 1500
• Jeep models including Cherokee, Grand Wagoneer, and Wagoneer
• Plymouth vehicles like Sundance and Acclaim
• Saab 900 and 9000 series

Common Issues Addressed by Bosch Spark Plug 8118

• Engine misfires and rough idling
• Reduced fuel efficiency due to incomplete combustion
• Difficulty starting the engine in cold conditions
• Increased emissions from worn or fouled plugs
• Interference with vehicle electronics caused by spark plug resistance

Installation Notes and Tips

Ensure the spark plug gap is set to 1.1 mm before installation if not pre-gapped. Use a 20.8 mm socket wrench for proper tightening torque to avoid damage to the flat seat. Confirm compatibility with your vehicle’s engine specifications, especially thread diameter (14 mm) and reach (19 mm). It is recommended to replace spark plugs in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Bosch OE Fine Wire Double Platinum spark plugs are manufactured to meet strict OEM standards, ensuring consistent quality and performance. The 8118 spark plug includes a resistor to minimize electrical interference and is constructed with durable materials such as platinum and ceramic. Warranty coverage details should be confirmed with the vehicle manufacturer or Bosch directly.