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Motorcraft SP-542 plug superseded by SP-578? - NGK Ruthenium HX - New Plug Installation DIY


boostededge

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Installed the new NGK's this morning.

 

The old plugs looked very good and no change in gap - just thought that there may be benefits with the revised heat range plugs.

 

Looked into the cylinders and they're all pristine, like brand new.

 

IMG_2032.JPG

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