The "R" in Denso's part numbers indicates a . Resistor plugs incorporate a 5,000-10,000 ohm internal resistor to suppress electromagnetic interference (EMI) and radio frequency interference (RFI) generated by the ignition system. Modern vehicles with sensitive electronics (ECUs, radios, navigation systems) require resistor-type plugs to prevent electrical noise from causing malfunctions.
Because the Denso 5285 ignites the air/fuel mixture more consistently, more of the fuel is burned during the power stroke. Users typically report a after replacing worn or standard plugs. denso 5285
| Feature | Denso 5285 (TT) | NGK Iridium IX | Bosch Double Iridium | | :--- | :--- | :--- | :--- | | | 0.4mm Iridium | 0.6mm Iridium | 0.5mm Iridium | | Ground Electrode | 0.7mm Platinum (Tapered) | Standard Platinum pad | Iridium (Flat) | | Voltage Requirement | Lowest | Medium | Low | | Durability | 100k miles | 80k miles | 100k miles | | Best For | Fuel economy & smooth idle | High RPM performance | Turbocharged engines | The "R" in Denso's part numbers indicates a
The internal electromagnet acts within microseconds to optimize pilot, main, and post-injection phases. Because the Denso 5285 ignites the air/fuel mixture
Custom blade geometry ensures maximum air displacement with minimal cabin decibel levels.
: Manufactured to the same specifications as the original parts installed during vehicle production. Climate Control Integration