Spark Plug: Adjustment
WARNING: This page is about a different car, the 2006 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
Correct it if the spark plug gap is measured with a gap gauge, and it is necessary.
Spark plug gap: L 1.0 - 1.1 mm (0.039 - 0.043 in)
Courtesy of SUBARU OF AMERICA, INC.
NOTE:
Replace with new spark plug if this area is worn to "ball" (A) shape.