If you can’t determine if it is carbon or oil fouling, smell the plug. This video is sponsored by Autolite.
Most modern engines put the spark plug in a deep well between the camshafts. This video is sponsored by Autolite.
Make sure to inspect the old spark plugs and boots before you install the new ones. This video is sponsored by Autolite.
Each cause of oil fouling indicates different engine problems. This ASE G1 test prep video is sponsored by Autolite.
Spark plugs are the “canary in the coal mine” of the combustion chamber. The electrodes and porcelain can reveal short- and long-term problems if you know where to look.