Pack of 8 Nickel Spark Plugs SP515 SP546 for Ford 4.6L 5.4L 6.8L

In this review the Pack of 8 Nickel Spark Plugs (SP515/SP546) is evaluated for owners of Ford V8 and V10 engines who need an OEM-compatible replacement. The bottom line: these plugs offer a direct-fit alternative for many 2004-2010 Ford Super Duty, F-Series, Mustang, Expedition, Navigator and related Lincoln/Mercury models and prioritize corrosion resistance and steady ignition. For anyone looking for a cost-effective, OEM-number-compatible set that aims to restore reliable starts and stable idle, this pack is a practical option backed by a 1 year or 50,000 mile warranty.

Key Features

• OEM compatibility: Lists multiple OEM part numbers such as SP515, SP546 and FD508T so buyers can match to factory references for a correct fit.
• Wide fitment: Designed for Ford Expedition, Explorer, F150, Super Duty trucks, Mustang and Lincoln/Navigator models with 4.6L, 5.4L and 6.8L V8/V10 engines for convenient fleet or multi-vehicle purchases.
• Nickel construction: Nickel electrode construction improves corrosion resistance and aims to deliver a longer service life versus low-grade plugs.
• Improved efficiency: The manufacturer cites better fuel economy and lower emissions due to consistent spark delivery under normal driving conditions.
• Durability focus: Laser welded fine iridium tips are referenced for steady spark and faster startup, contributing to reliable ignition performance.
• Warranty: A 1 year or 50,000 mile warranty provides short-term coverage and peace of mind after installation.

Who It's For

These spark plugs are best for owners and mechanics who need a direct-replacement set for Ford vehicles from the mid 2000s to early 2010s with 4.6L, 5.4L or 6.8L engines, including V8 and V10 applications. Fleet owners and DIYers replacing all eight plugs at once will appreciate the matching pack size and listed OEM numbers for cross-referencing.

Those seeking ultra-high-performance race plugs or platinum/iridium long-life plugs should look elsewhere; this nickel-based option is intended as a reliable, OEM-style replacement rather than a specialized performance upgrade.

Pros & Cons

Pros

• Direct-fit compatibility across many Ford, Lincoln and Mercury models simplifies selection and replacement.
• Nickel construction helps resist corrosion and aims to maintain consistent performance over time.
• Includes OEM part number cross-references for easier verification against factory specs.

Cons

• Not a dedicated long-life platinum or iridium plug family, so longevity may be shorter than premium specialty plugs.
• Some buyers may prefer brand-name OE plugs for dealer-level warranty continuity.

Specifications

Our Verdict

The Pack of 8 Nickel Spark Plugs is a sensible, value-focused replacement for mid-2000s Ford and related vehicles that need matched spark plugs across all cylinders. It delivers OEM part number compatibility, corrosion-resistant nickel construction, and a useful warranty, making it a good choice for routine maintenance or full-plug replacements. For buyers who prioritize long-term premium longevity, consider higher-end platinum or iridium single plugs instead.

Frequently Asked Questions

Are these plugs a direct fit for Ford 5.4L engines?
Yes, the pack is listed for 5.4L Ford engines in F150 and several Super Duty, Expedition and Lincoln models for the specified years.

Do these plugs include a warranty?
Yes, they come with a 1 year or 50,000 mile warranty as stated by the manufacturer.

Should I choose these over iridium single plugs?
If you want OEM-compatible, cost-effective replacements these are appropriate; choose iridium or platinum if you need extended longevity or higher-performance tolerance.