How long will the repair take?
Documented on the 2012 Ford Mustang GT build
Published February 26, 2026
A competent DIYer should budget 2–4 hours for the full job (inspection, removal of valve covers, replacement of seals, cleaning wells, replacing plugs, and reassembly).
Documented In This Build
Related Knowledge
What causes oil to fill the spark plug wells?Can I drive the car if the plugs are covered in oil?Do I need to replace the ignition coils too?Is this an expensive repair?How do I know if the PCV grommet is bad?What torque should I use for the coil mounting bolt?How often should I clean the fuel injectors?Can I use a pour-in fuel additive instead of an inline cleaning kit?
Related Parts
Dielectric grease
$6
Valve cover gasket set with spark plug tube seals
Motorcraft (typical OEM for Ford) / aftermarket equivalents$75
Spark plugs (set of 8)
NGK / Motorcraft$90
RTV silicone sealant (small tube)
$5
Engine degreaser / shop towels
$10
Related Tools
Torque wrench
Socket set & ratchet (including 10mm, 8mm, extensions)
Spark plug socket (5/8" or 13/16") with extension and swivel
Flat screwdriver / gasket scraper
Shop vacuum / compressed air
