BOSCH PREMIUM CLASS PLATINUM+4 SPARK PLUGBosch Premium Class Platinum+4 Spark Plug contains the most platinum in the Bosch Platinum Plug Series and has a unique firing technology that combines the advantages of surface air gap technology and 4 yttrium enhanced ground electrodes.
Specifications:- 14 mm thread size
- 17.55 mm reach
- 16 mm hex size
- Platinum plug
- Tapered seat style
- Interference suppression resistor
- Surface air gap plug
- Heat fused platinum center electrode
- 4 ground electrodes
- Heat range 8
Features:- Reduces the voltage necessary to jump the gap as well as quenching
- Provides multiple radial spark paths and surface air gap design that creates optimal exposure of the air/fuel mixture to the enhanced ignition spark
- Yttrium-enhancement of the ground electrodes further extend plug life
- Designed to reach self cleaning temperature faster for quicker starts, smoother acceleration, and increased fuel efficiency
