SYKRSS Iridium Spark Plugs 6509 6-Pack for Ford 3.5L V6 — Iridium Tip, Copper Core

SYKRSS Iridium Spark Plug 6509 is a six-pack replacement set engineered to match OE fit and deliver reliable ignition for Ford 3.5L V6 engines from 2011–2020.

These SYKRSS iridium plugs are built to the OEM form, fit, and function for vehicles that list part number 6509 (XP5263 LTR6IX11). Each plug combines an iridium firing tip, copper core and ceramic insulator to provide consistent spark energy across typical driving conditions. The pack includes six plugs and a brief manual, plus SYKRSS customer support.

Which vehicles are compatible with this SYKRSS 6509 spark plug set?

The SYKRSS 6509 plugs are designed for Ford models using the 3.5L V6 and other engines that specify the same OE part numbers. Compatibility spans multiple model years and several Ford nameplates; always check your vehicle’s engine code or OEM part number before purchase.

• Ford Explorer 3.5L V6: 2011–2020
• Common fitments: Ford Mustang (2011–2017), F-150 (2011–2021), Flex, Taurus and other models using the same OE reference
• Replace when OEM part number matches XP5263 / LTR6IX11 / 6509

How do these iridium plugs affect starting, fuel use and engine response?

Iridium tips provide a finely focused electrode that helps the ignition coil deliver a concentrated spark. That can lead to more consistent combustion across cylinders, smoother idle and more reliable cold starts compared with worn or standard copper plugs.

• Iridium tip for durable, high-energy sparks
• Copper core for improved conductivity and heat transfer
• Stable combustion helps reduce misfires and rough idling when plugs are in good condition

What construction and quality checks are used on SYKRSS 6509 plugs?

Each SYKRSS plug combines an iridium firing tip, a copper center core and a ceramic insulator designed to match OE geometry. Units undergo factory testing to confirm stable high-voltage output and to reduce common ignition issues such as misfires or inconsistent firing.

• Iridium electrode for wear resistance and precise spark gap retention
• Copper core for reliable conductivity under load
• Manufacturing tests to verify electrical output and mechanical dimensions

How should I install and maintain these spark plugs to get the longest life?

Installation should follow the factory torque and gap specifications for your engine—use a torque wrench and anti-seize only if specified by the vehicle maker. Periodic inspection during routine service intervals helps confirm gap and condition; replace all six plugs together for balanced combustion.

• Follow OEM torque and gap values during installation
• Replace as a set to maintain balanced ignition timing and performance
• Check coil boots and ignition wiring when replacing plugs

Who is this for: Owners, DIY mechanics and service shops that need a direct-fit iridium replacement for Ford 3.5L V6 engines (and other compatible vehicles) will find this SYKRSS 6-pack useful. It suits drivers seeking longer-lasting electrodes than standard plugs, an OE-equivalent geometry for straightforward swap-in installs, and a full set to service all cylinders at once. Always confirm part compatibility with your vehicle’s year, engine and OEM part number before purchase.