Set of 8 Ignition Coil Pack DG521 and Iridium SP509 - Vehicle

In this review the Set of 8 Ignition Coil Pack DG521 and Iridium Spark Plugs SP509 is evaluated as a complete replacement kit for several Ford and Lincoln V8/V10 models. The bottom line: this kit is best for owners comfortable verifying OE numbers and doing a straightforward plug-and-coil swap who want a cost-effective way to restore spark performance and address misfires or check engine lights. Our review found the kit offers reliable ignition performance and simple installation for compatible 2008-2016 engines when parts match the vehicle OE numbers.

Key Features

• Compatibility: The kit covers a wide range of Ford and Lincoln V8 and V10 engines, including 4.6L, 5.4L and 6.8L models from 2008-2016, so many owners of these trucks and SUVs will find a direct-replacement option.
• Complete set: Includes eight ignition coils and eight iridium spark plugs so an entire bank or full V8/V10 ignition service can be completed in one job without mixing old and new parts.
• OE fit and function: Components are designed to meet or exceed OE specifications in form, fit and function, helping ensure the replacements seat and connect correctly when the correct OE numbers match.
• Durability: The coils are made from high heat temperature resistant material intended to withstand heat stress and provide longer service life under normal operating conditions.
• Performance restoration: The kit is intended to address common ignition symptoms such as misfires, stalling and poor idling and can help clear check engine lights caused by coil or plug failures.

Who It's For

This kit is aimed at owners and independent mechanics who work on 2008-2010 Ford F-150, 2008-2009 Expedition and Navigator, 2008-2010 Explorer Sport Trac, 2008-2010 F-250/F-350 6.8L V10 applications, 2008-2010 Mustang 4.6L, and some 2015-2016 F-450/F-550 Super Duty 6.8L engines. It is ideal when a full-bank replacement is preferred to ensure matched coil and plug performance.

Buyers should confirm compatibility by checking the vehicle year/make/model and the OE numbers listed for remplacement parts before purchase. Those who need dealer-branded parts, or who are unsure about matching OE numbers, should consult a parts specialist or consider purchasing by exact OE part numbers instead.

Pros & Cons

Pros

• Complete eight-coil and eight-plug kit allows full ignition service without mixing old components.
• Designed to meet or exceed OE specifications, improving chances of a direct-fit replacement.
• Customers report improved functionality and value for money, with some noting a cleared check engine light after installation.

Cons

• Fit can vary: some users report alignment or fitment issues with spark plugs on certain applications, so confirm OE numbers before ordering.

Specifications

Brand	SYKRSS
Included Parts	8 ignition coils, 8 iridium spark plugs, 1 manual
Compatible Engines	4.6L V8, 5.4L V8, 6.8L V10 (selected years)
Compatible Models	Ford F-150, F-250, F-350, F-450, F-550, Mustang, Expedition, Explorer Sport Trac, Lincoln Navigator, Lincoln Mark, Mercury Mountaineer
OE / Replace Numbers	DG521, FD509, 8L3Z12029A, 5C1716, E509, IC697 (check image/item page)
Spark Plug OE	SP509 PZNAR6A11H
Warranty	24 months customer support

Our Verdict

This SYKRSS set is a practical, cost-effective option for owners who need a full-bank ignition replacement on compatible Ford and Lincoln V8/V10 engines and who verify OE numbers prior to purchase. It delivers most of the expected benefits-restored spark, easier starts, and fewer misfires-at a fraction of dealer pricing, though buyers should check fitment carefully to avoid alignment issues on specific engines.

Frequently Asked Questions

Will these coils and plugs fit my vehicle?
Check the vehicle year, make, model and the listed OE replaceable part numbers against your current parts; compatibility is specific to listed 4.6L, 5.4L and 6.8L applications.

Can one replace only a few coils or plugs from this kit?
Yes, the kit contains eight coils and eight plugs so you may install only the needed units, but many buyers prefer a full-bank replacement for matched performance.

What problems can this kit fix?
It is intended to address misfires, backfiring, rough idling, stalling and some check engine light codes caused by failing coils or spark plugs when installed correctly.