NGK Spark Plug Stock # 4904

The NGK Spark Plug Stock # 4904 (MPN: ILFR6T11) is a premium iridium-core ignition component engineered for reliable engine starting and consistent combustion across a wide range of automotive applications. As a mechanic and performance enthusiast, you know that spark plugs are the foundation of engine efficiency—they're the direct link between your ignition system and combustion chamber. NGK's ILFR6T11 is designed for drivers and technicians who demand OEM-quality performance without the dealership markup, making it an ideal choice for both routine maintenance and engine rebuild projects.

This spark plug features NGK's proven iridium electrode technology, which burns hotter and lasts longer than conventional copper designs. The fine-wire iridium center electrode reduces quench distance and improves flame kernel formation, translating to better cold starts, smoother idle quality, and superior fuel economy across all throttle positions. The robust ceramic insulator and proven construction minimize electrode erosion over extended service intervals, while the tapered seat design ensures a gas-tight seal in the combustion chamber. NGK's manufacturing tolerances are tight, meaning you get consistent spark timing and arc characteristics critical for modern engine management systems and fuel injection tune-up.

The ILFR6T11 is compatible with a broad spectrum of domestic and imported passenger vehicles, and it's the go-to choice for technicians performing scheduled maintenance or addressing no-start and rough-idle complaints. Whether you're refreshing spark plugs on a fleet vehicle, rebuilding a performance engine, or simply keeping your daily driver running strong, this NGK plug delivers the dependability you've come to trust. Installation is straightforward—verify gap setting against your vehicle's factory specification and seat firmly with a proper spark plug socket. This is a direct replacement part available for immediate delivery, backed by NGK's reputation for engineering excellence and longevity.