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Decent.
Priced as of June 1, 2026
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Prices may varyThis product ranks #9 of 18 in Spark Plug.Three above it ↓
Last reviewed June 1, 2026
TL;DR Motorcraft SP-509 (HJFS-24FP) is Ford's OEM platinum plug for V8 and V10 engines, interchangeable with SP-509-X. Platinum center electrode, 4.892µm tip; no stated service interval.
Motorcraft is Ford's OEM parts brand; SP-509 / HJFS-24FP is physically identical to SP-509-X per Ford box labeling. Platinum center electrode, 4.892µm fine-wire tip confirmed from packaging; nickel top; Made in Japan. Covers Ford V8 and V10 applications (6.8L V10, 5.4L V8, F-Series, Expedition); Amazon lists only the F-59 Commercial Stripped Chassis. Factory gap may ship wider than OEM spec for some engines: owners report the 5.4L flex-fuel application needed gap adjustment. No service interval stated.
Right pick for Ford V8 and V10 owners whose OEM manual specifies the SP-509 or HJFS-24FP. Skip if you need a stated mileage rating or your engine specifies iridium.
No chemical exposure pathway: ceramic-and-steel ignition part, no SDS. Platinum electrodes carry a precious-metal mass offset by longer service life than copper. Steel shell is recyclable as ferrous scrap; alumina-ceramic insulator goes to landfill. No take-back program.
Amazon's feature bullets list the Ford F-59 Commercial Stripped Chassis with the 6.8L V10. Community owners confirm the SP-509 also fits the Ford F-150 with the 5.4L V8 (including flex-fuel variants), the 5.0L V8, and the Ford Expedition, among other Ford V8 and V10 applications. Always confirm the OEM application guide for your specific year, engine, and model before installing.
Yes. Ford's product packaging states 'SP-509 and SP-509-X INTERCHANGABLE' · both part numbers refer to the same physical plug (also cross-referenced as HJFS-24FP and HJFS-24FP-X). The SP-509-X listing on Amazon shows as the newer catalog entry, but the plugs are physically identical.
The SP-509 ships with a factory gap, but owners note the factory gap may be wider than the OEM spec for some applications. Always verify the correct gap for your specific engine in the owner's manual before installation.
Yes. The single-plug ASIN (B001HY6EIA) is an Amazon add-on item and requires a minimum qualifying order or a Subscribe and Save purchase to buy standalone. Availability may be limited since SP-509 is being superseded in the Amazon catalog by SP-509-X (B09GW9CMHN).
Marketing copy from Motorcraft, via Amazon. Not editorial.
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