Motorcraft SP-580X Iridium Spark Plug
Priced as of May 28, 2026
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CarCareTruth's Analysis
Last reviewed May 28, 2026
TL;DR Motorcraft SP-580X (CYFS-12Y-T4X) is Ford's OEM iridium plug for the 3.5L EcoBoost and 5.0L Coyote V8, pre-gapped to 0.035 in, 60,000-mile Ford-specified interval.
What it is and how it performs
Motorcraft is Ford's OEM parts brand; SP-580X and CYFS-12Y-T4X are the same part under dual numbering, superseding the platinum-generation SP-534. Iridium center electrode; tip diameter not disclosed. Thread spec is M14x1.25 per Ford OEM (Amazon incorrectly lists M10x1.0). Ford specifies a 60,000-mile interval; Cory K's verified-purchase review (Nov 2025) confirms reaching interval with appropriate wear and correct gap at removal; removal-photo evidence not yet located. Fitment confirmed across 3.5L EcoBoost F-150, Expedition, and Explorer; one conflicting report (Aug 2023) disputes 5.0L Coyote fitment.
Who should buy this, and who should skip it
Right pick for 14th-gen F-150 owners with the 3.5L EcoBoost or 5.0L Coyote V8 wanting the Ford OEM plug; community-confirmed EcoBoost fitment, gap pre-set. Skip for the 2.7L EcoBoost, which takes the SP-542.
Safety and environmental impact
No chemical exposure pathway: ceramic-and-steel ignition part, no SDS. Iridium electrodes carry a small precious-metal mass offset by the 60,000-mile interval vs. copper. Steel shell recyclable; ceramic insulator landfills. No take-back program as of 2026.
Frequently asked questions
What Ford vehicles does the Motorcraft SP-580X fit?▾
The SP-580X (Ford dealer part number CYFS-12Y-T4X) is the Ford OEM spark plug for the 3.5L EcoBoost and 5.0L Coyote V8 in the 14th-generation Ford F-150 (2021-2026). Community reviews also confirm it for the Ford Expedition and Ford Explorer 3.5L EcoBoost across several model years. The 2.7L EcoBoost uses a different plug (SP-542/CYFS-12Y-T3); confirm via Ford's application guide for your specific engine.
Why does Amazon show Thread Size: M10x1.0 for the SP-580X?▾
That is an Amazon catalog data entry error. The Ford OEM spec for the 3.5L EcoBoost and 5.0L Coyote cylinder head is M14x1.25. Amazon also incorrectly lists 'Vehicle Service Type: Motorcycle' for this part number. Both are known errors in Amazon's product database, not in the plug itself. The plug fits standard Ford V6 and V8 cylinder heads with M14x1.25 threads.
What is the SP-580X gap and service interval?▾
Ford specifies a 0.035 in factory gap for this application. Multiple verified-purchase reviewers confirm the plugs arrive pre-gapped to spec out-of-box. Ford's OEM service interval for this plug in the 3.5L EcoBoost and 5.0L Coyote is 60,000 miles. A verified-purchase buyer confirmed reaching 60,000 miles on an EcoBoost with appropriate wear and correct gap at removal.
Is the SP-580X an Amazon add-on item?▾
Yes. The single-plug ASIN (B09GW9RFP7) is an Amazon add-on item and requires a minimum qualifying order or a Subscribe and Save purchase to buy standalone. If you need to buy singles without bundling, consider adding other qualifying items to your cart, or check the Pack of 2 (B0CDQN11X4) for separate add-on item status.
From the manufacturer
Marketing copy from Motorcraft, via Amazon. Not editorial.
- •Motorcraft Spark Plug - SP580X
- •SP580X
Confirmed fitment
Per manufacturer cross-reference. Verify on Amazon before purchase.
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Manufacturer images
Manufacturer specifications
- Brand
- Motorcraft
- Core Material
- Alloy Steel
- Thread Size
- M10x1.0
- Top Material Type
- Alloy Steel
- Vehicle Service Type
- Motorcycle
- Brand Name
- Motorcraft
- Manufacturer Part Number
- SP580X
- UPC
- 031508776715
- OEM Equivalent Part Number
- SP580X
- Model Number
- SP580X
- Unit Count
- 1.0 Count
- Included Components
- Spark Plug
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Top Amazon review
↗External — Amazon's most-helpful review for context.
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OEM spark plugs and good quality, engine runs smoother and starts quicker. After 60k miles it was time to replace the plugs, I purchased the vehicle used and first thing I always do is replace the plugs. Not sure how much mileage the original plugs saw but they had some serious pitting, these EcoBoost engines run hot and the plugs definitely take a beating. The gap was perfect on all the plugs, but still best to check before installing. No issues installing the plugs other than the usual corroded bolt on the coil, there's a few videos out there on how to fix this.