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Prices may varyThis product ranks #15 of 28 in Spark Plug.Three above it ↓
Last reviewed June 30, 2026
TL;DR Motorcraft is Ford's OEM parts brand; the SP-520 is the factory replacement plug for the 3.7L Ti-VCT V6 in the 12th-gen F-150. Sold individually -- the V6 needs 6. Community owners confirm correct fitment for F-150, Mustang V6, and Edge 3.7L applications despite Amazon catalog errors on the listing.
The SP-520 (CYFS-12F5) is Motorcraft's OEM replacement plug for the 3.7L Ti-VCT V6 used in the 2011-2014 F-150, 2011-2017 Mustang V6, Ford Edge, and Lincoln MKX. Amazon's listing carries catalog data errors -- "M10x1.0 thread," "Motorcycle," and "Iridium core" -- all of which are documented Amazon mis-categorizations for Motorcraft plugs, not defects in the plug. Community reviews confirm correct fitment on 3.7L V6 applications with no misfiring or installation issues reported. Superseded by SP-589 in Ford's current catalog; SP-520 remains a valid direct replacement.
Right pick for any 2011-2014 F-150 owner with the 3.7L Ti-VCT V6 at the OEM service interval. Also covers Mustang V6 (2011-2017) and Ford Edge/Lincoln MKX 3.7L. Skip if your F-150 has the 5.0L Coyote V8 (use SP-548) or the 3.5L EcoBoost (use SP-580X). Buy 6 units -- this listing is a single plug.
No chemical exposure pathway: the SP-520 is a passive ignition-system replacement part with no SDS. The platinum electrode tips carry a small precious-metal mass per plug, partially offset by the service interval. The steel shell is recyclable as ferrous scrap; the alumina-ceramic insulator goes to landfill via standard municipal disposal.
The SP-520 (Ford part number CYFS-12F5) is the Ford OEM replacement spark plug for the 3.7L Ti-VCT V6. In the 12th-generation F-150, that covers the 2011-2014 model years with the 3.7L option. It also fits the Ford Mustang 3.7L V6 (2011-2017), Ford Edge 3.7L, and Lincoln MKX 3.7L. Confirm against Ford's application guide for your specific VIN.
Those are confirmed Amazon catalog data entry errors. The SP-520 fits standard Ford 3.7L V6 cylinder heads with 14mm x 1.25 threads, not a 10mm thread. Amazon also mislabels several other Motorcraft spark plugs with similar Motorcycle or thread-size errors. The product itself is correct for the 3.7L Ti-VCT V6.
Both are valid. Ford superseded SP-520 with SP-589 in its current parts catalog, but SP-520 remains a correct OEM direct replacement. If you find SP-589 in stock, it is Ford's current-catalog choice; SP-520 is the prior version and installs the same way.
The 3.7L Ti-VCT V6 has 6 cylinders and requires 6 spark plugs. This listing is sold as a Pack of 1, so you will need to purchase 6 units for a full engine set.
Ford's OEM service specification for the 3.7L Ti-VCT V6 is in the 0.049-0.053 in range. The gap is not explicitly stated on the Amazon listing. Verify the gap with a feeler gauge before installation regardless of factory pre-set.
The Amazon listing for Motorcraft SP-520 Spark Plug carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including rubber, vinyl, plastic, and metal automotive parts — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive accessory, Motorcraft SP-520 Spark Plug has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from Motorcraft, via Amazon. Not editorial.
Per manufacturer cross-reference. Verify on Amazon before purchase.
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