Bosch Super 4 Spark Plug — YR78X
The Bosch Super 4 YR78X is a high-performance, multi-electrode spark plug engineered to deliver reliable ignition, extended service life, and improved combustion efficiency for modern gasoline engines.
Designed with Bosch’s advanced Super 4 technology, the YR78X enhances spark stability by using four strategically placed ground electrodes around a premium central electrode. This large firing area produces a more complete and consistent spark, helping improve engine smoothness and throttle response.
Key Features:
Multi-Electrode Design:
The Super 4 configuration uses four ground electrodes to surround the central electrode, increasing the area where spark initiation can occur — which leads to more consistent ignition and improved performance across different operating conditions.
Premium Materials:
Constructed with high-quality materials including platinum/palladium-enhanced electrodes, the YR78X resists wear and erosion for longer service intervals compared to standard spark plugs.
Built-In Resistor:
Integrated resistor technology helps suppress electrical noise (“RFI/EMI”), protecting engine electronics and ensuring stable performance in vehicles with sensitive ignition control systems.
Precise Engineering:
Factory-gapped spark design and stringent manufacturing standards help ensure reliable fit, consistent gap integrity, and repeatable performance throughout the plug’s life.
Benefits:
• Extended life span — Lasts longer than conventional spark plugs thanks to advanced electrode materials.
• Stable combustion — Multiple spark paths help reduce misfires and promote smoother idle and acceleration.
• Better fuel efficiency — More complete combustion supports improved fuel economy and reduced emissions.
• Reliable performance — Works well under a wide range of temperature and load conditions.
Typical Uses:
The Bosch Super 4 YR78X is ideal for:
• Modern gasoline engines with electronic ignition systems
• Passenger cars seeking improved durability and consistent spark quality
• Vehicles with longer recommended service intervals
• Engines where combustion efficiency and smooth idle are priorities
