One year limited warranty for replacement only.

What size socket size do i need

These require a 7mm socket. be sure to get an extension or a deep well to have room to maneuver.

Are they double platinum ?

Yes, for SP509 ,it is Double Platinum spark plug.

Anyone know if these plugs have any issues? I know 5.4 motors were bad. if you had an easy experience replacing olugs or a bad experience please respo

They changed head design in mid 2008 So end of 2008 and newer they are fine and no worse than changing plugs on anything else. This is the updated design. Ford noted the new design by using brown coil boots. So you would have to pull one to find out if you have new or old style. Black boots is the 2 piece.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

MAS Ignition Coils DG521 and Motorcraft SP-509 Spark Plugs compatible with Ford Expedition F-150 Super Duty F-250 F-350 F-450 F-550 F-350 F53 4.6L 5.4L 6.8L C1659 DG521 8L3Z-12029-A

Product ID: 589834401

Details

Brand
MAS
Connector gender
Installation type
Bolt-On or
Item weight
4 Pounds
Vehicle service type
Car Van

⚡High energy output ignition

🔥Heat-resistant coil boots

🔧Direct bolt-on replacement

Description

⚡ Ignite your Ford’s power with precision and durability!

TRUSTED OEM QUALITY - Manufactured with premium materials and backed by a 1-year limited warranty for peace of mind.
DURABILITY UNDER FIRE - High-heat resistant coil boots designed to withstand extreme engine temperatures for longer lifespan.
PRECISION ENGINE MATCH - Specifically engineered for Ford 4.6L & 5.4L V8 engines to maximize performance and reliability.
EFFORTLESS INSTALLATION - Bolt-on, direct replacement design means no modifications—get back on the road faster.
COMPLETE IGNITION UPGRADE - Includes 8 DG521 ignition coils with brown boots plus 8 Motorcraft SP-509 spark plugs for a full system refresh.

This set includes 8 high-quality MAS DG521 ignition coils with brown boots and 8 Motorcraft SP-509 spark plugs, designed as direct replacements for Ford V8 4.6L and 5.4L engines (2008-2014 models). Engineered for optimal ignition performance and heat resistance, these components ensure reliable starts and smooth operation, making it the ultimate complete ignition system upgrade for Ford Expedition, F-150, Super Duty trucks, Mustang, Lincoln Navigator, and Mercury Mountaineer.

Specifications

ASIN	B07BX7L9SF
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#86,693 in Automotive ( See Top 100 in Automotive ) #184 in Car Ignition Coils
Brand Name	MAS
Compatible with Vehicle Type	Car, Van
Connector Gender	Female-to-Male
Customer Reviews	4.3 4.3 out of 5 stars (535)
Installation Type	Bolt-On or Screw-In
Item Weight	4 Pounds
Manufacturer	MAS
Manufacturer Part Number	DG521SP509
Number of Items	1
OEM Equivalent Part Number	C1659, DG 521, FD-509, 5C1716, 8L3Z12029A / 8L3Z-12029-A, C1659, GN10233, 5C1716, E509, 52-2071, IC697, 8L3Z-12029-A, HJFS-24FP, SP-509, SP509
Part Interchange Info	replacement
UPC	716253448499
Unit Count	1 Count

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews