MAS Ignition Coil & Spark Plug Kit, 8-PACK Straight-Boot DG511 for 5.4L V8 — Platinum Plugs

MAS complete ignition kit pairs eight straight-boot DG511 ignition coils with eight Motorcraft platinum spark plugs to restore consistent spark for 5.4L Ford and Lincoln V8 engines.

This kit combines MAS aftermarket ignition coils (DG511, straight boots) with Motorcraft platinum spark plugs (SP515/SP546 compatible) to replace worn ignition components on select Ford Expedition, F-150, F-250/F-350 Super Duty, Lincoln Navigator and Mark LT vehicles equipped with the 5.4L V8. The package is sized for a full-bank replacement—eight coils and eight plugs—so you replace all cylinders at once for balanced performance and easier troubleshooting. Included compatibility references and multiple OEM cross-numbers make it straightforward to confirm fit before purchase.

How do I confirm these coils and plugs fit my vehicle?

Check the shape of your existing coil boots and your vehicle's model-year range. This MAS kit is designed for straight-boot coils (DG511); if your coils have curved or brown boots, this kit is not the correct match. Cross-referencing OEM part numbers or comparing cylinder-count and engine size will avoid misorders.

• Fits 5.4L V8 Ford/Lincoln models from the mid-2000s (see make/model list below).
• DG511 = straight-boot coil option; DG508 = curved boot; DG521 for brown boots.
• Compare part numbers: 3L3E-12A366-CA, C1541, UF537, FD508 and others listed.
• Full-kit contains 8 coils + 8 Motorcraft-compatible platinum plugs.

What performance and reliability benefits should I expect after installation?

Replacing all ignition coils and spark plugs together helps restore even ignition timing and consistent combustion across cylinders, which can improve throttle response and smooth idle. While results vary with vehicle condition, fresh coils and plugs usually reduce misfires and can improve drivability compared with worn components.

• More uniform spark delivery across all eight cylinders.
• Reduced chance of cylinder misfire and related error codes.
• Potential smoother idle and crisper throttle response.
• Convenience of a full-bank replacement for easier diagnostics.

How do I install the MAS DG511 coils and Motorcraft plugs?

Installation is a standard service for mechanically inclined DIYers or a routine job for any professional mechanic. Always follow torque specs for spark plugs and secure electrical connectors for coils to avoid damage. Replace one cylinder at a time if working solo to prevent mix-ups.

• Disconnect the battery before starting work for safety.
• Remove ignition coil mounting bolts, unplug harness, and pull coil straight up.
• Install new spark plug with proper gap (use manufacturer spec) and torque to spec.
• Seat new coil onto plug, reconnect harness, and tighten mounting bolts to spec.

What warranty and support come with this kit?

MAS includes a limited one-year warranty with the ignition kit, covering defects in materials and workmanship under normal use. Keep your purchase documentation and note vehicle fitment information in case you need assistance; warranty terms vary by seller.

• One-year limited warranty from MAS.
• Package contains 8 MAS DG511 coils and 8 Motorcraft-compatible platinum plugs.
• Check seller return policy for fitment returns before installation.

Who is this for: This kit is aimed at owners and mechanics who need a complete ignition-bank replacement for mid-2000s Ford and Lincoln 5.4L V8s—including Expedition, F-150, F-250/F-350 Super Duty, Navigator and Mark LT—when the vehicle uses straight-boot ignition coils. It suits anyone wanting to replace all coils and plugs at once for consistent ignition, simplified troubleshooting, and to help restore reliable engine performance. Confirm boot style and OEM cross-references before ordering to ensure correct fit.