Any difference in Motorcraft SP498 and Autolite AP5143 spark plugs?

bighank

New Member
Sep 1, 2006
16
0
2
Maryland

See that the 4.0 V6 calls for Platinium Motorcraft SP498 (AGSF24FM) spark plugs. Motorcraft plugs are made by Autolite. Autolite platinium plug AP5143 appears to be identical but is about $1 cheaper per plug.
Does anyone know if these 2 plugs are identical?
Looked around for compatibility and substitution guides but haven't found the specs on these plugs.
 
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bighank

New Member
Sep 1, 2006
16
0
2
Maryland
Looked at both plugs. Construction looks identical. Autolites are BLACK while Motorcraft look like shiny nickel or maybe platinum. Both are supposedly platinum.
Will spend the extra $1 per plug to get the ones which look like platinum.
 
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