Built by NGK, the NGK IX Iridium Spark Plug Box of 4 (TR6IX) – Plugs – 3689 replaces a part that was never meant to keep up. NGK has spent decades chasing tolerances most buyers never see, and it shows in how this spark plug seats, seals and holds up after a few heat cycles.

NGK has spent decades chasing tolerances most buyers never see, and it shows in how this spark plug seats, seals and holds up after a few heat cycles. If you are shopping a spark plug for the applications listed by the manufacturer, the NGK IX Iridium Spark Plug Box of 4 (TR6IX) – Plugs – 3689 is the piece that earns its keep.

• Genuine NGK spark plug, part number 3689
• Engineered fitment for the applications listed by the manufacturer
• Direct replacement or upgrade for the factory piece, using factory mounting points
• Built from materials rated for real heat, load and weather, not showroom duty
• Backed by the manufacturer warranty and by our own fitment support before you order
• Ships from current production stock through our direct distribution account
• Shipping weight about 0.39 lb, packed to arrive undamaged
• Sold as a set of 4

Fitment: the applications listed by the manufacturer. Always match the year, make, model, engine and trim of your vehicle against the manufacturer listing before ordering, and check any option codes that change the part on your build.

We ship direct from the manufacturer network, so you get current production stock, not shelf-worn boxes. Order it today and it leaves Turn 14 Distribution direct to your door, no middleman markup added.