SYKRSS Iridium Spark Plugs Set of 6 for 3.5L V6 Ford (LTR6IX11) — OEM Fit, Long-Life Iridium Tips

SYKRSS Iridium Spark Plugs 6509 (LTR6IX11) are a six-pack replacement designed to match OEM fit and deliver consistent ignition performance for 3.5L V6 Ford engines from 2011–2020 and other compatible models.

These SYKRSS plugs combine an iridium firing tip, copper core and ceramic insulator to provide a long-lived replacement that meets OE dimensions and electrical characteristics. Built and tested to address common ignition issues, the 6509 (LTR6IX11) plugs are made as direct-fit replacements for vehicles such as Ford Explorer (2011–2020), Mustang (2011–2017), Flex (2012–2019), F-150 (2011–2021) and select Taurus models. The set contains six plugs plus a user guide and is backed by SYKRSS customer support.

Will these spark plugs fit my 3.5L V6 Ford engine?

Yes — the SYKRSS 6509 (LTR6IX11) is made to match OEM specifications for many 3.5L V6 Ford engines. Confirm compatibility by matching the part number and engine year range before ordering.

• OEM cross-reference: LTR6IX11 / XP5263 / 6509.
• Designed for Ford Explorer 2011–2020 3.5L V6 (naturally aspirated and turbocharged where applicable).
• Also fits compatible Mustang, Flex, F-150, Taurus and other models — check your vehicle’s service manual or the product detail page.
• Always verify cylinder head thread size and reach to avoid fitment issues.

How do these iridium plugs affect starting and throttle response?

Iridium tips provide a small, durable electrode that requires less voltage to produce a strong spark, which helps with consistent ignition across operating conditions. That can translate into more reliable cold starts and stable throttle transitions, especially on engines that have worn or fouled original plugs.

• Iridium tip reduces electrode wear for longer service life.
• Copper core improves heat transfer and stable voltage performance.
• Ceramic insulator preserves spark isolation and reduces misfires.
• Manufacturing tests help ensure reliable coil output and spark consistency.

What problems can these plugs help address?

Worn or failing spark plugs can cause misfires, rough idle, sluggish acceleration, and reduced fuel efficiency. The SYKRSS iridium plugs are engineered to meet strict quality checks to help restore consistent combustion and reduce common ignition-related symptoms.

• Reduces misfires and unstable idling when plug wear is a factor.
• Helps improve ignition reliability across the RPM range.
• May contribute to smoother acceleration and steadier fuel burn.
• Tested to minimize premature fouling and inconsistent coil performance.

What comes in the box and how long can I expect them to last?

The package includes six SYKRSS spark plugs and a user manual. Lifespan depends on driving style and conditions, but iridium-equipped plugs generally outlast standard copper or nickel-plated plugs under normal use.

• Included: 6 spark plugs and one manual.
• Construction: iridium tip, copper core, ceramic insulator for longevity.
• Durability: iridium electrodes resist wear longer than conventional tips.
• Support: SYKRSS customer service and a one-year satisfaction window.

Who is this for: Drivers or technicians who need a direct-fit, long-lasting replacement for Ford 3.5L V6 engines and compatible models, and who want plugs built to OE dimensions with improved electrode life. Choose SYKRSS if you’re replacing a full set and want consistent ignition performance with a product that’s tested for common ignition issues and backed by manufacturer support.