CarCareTruth Score
Decent.
Opens Amazon in a new tab. No account needed to look.
Saved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
As an Amazon Associate I earn from qualifying purchases. Full disclosure
Prices may varyThis product ranks #16 of 31 in Spark Plug.Three above it ↓
Last reviewed August 13, 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.
The Amazon listing for Motorcraft SP-509 Platinum 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-509 Platinum 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.
Weekly pick
One product, one safety verdict, every week. No spam.
Denso
SK20HR11 Iridium Long Life Spark Plug
NGK
ILFR6T11 Laser Iridium Spark Plug
NGK
Laser Iridium SILFR6A11 Spark Plug
NGK
LFR6AHX-S Ruthenium HX Spark Plug
As an Amazon Associate I earn from qualifying purchases. Full disclosure
Community
0 postsShare how you use this product
Drop a quick comment or post a full review with photos and a star rating.
Sign in to postNew here? Create a free account.