Impreza F4-2.5L (2008)
Spark Plug: Specifications
Spark plug
Thread size (diameter, pitch, length) mm...............................................................................................................................................................14, 1.25, 19
Spark plug gap mm (in)......................................................................................................................................................................1.0 - 1.1 (0.039 - 0.043)
Tightening torque
1. RH SIDE
Tightening torque: 21 N.m (2.1 kgf.m, 15.5 ft.lb)
2. LH SIDE
Tightening torque: 21 N.m (2.1 kgf.m, 15.5 ft.lb)