Spark plugs

Part of S58 engine · about $170 to replace

What it is

Six iridium-tipped plugs, one per cylinder.

What it does

Ignite the mixture; the fine electrode keeps voltage demand low under boost.

How it fails

Change every 60,000 km, sooner with track use; misfire under boost is the classic symptom.

Material	Iridium centre electrode, nickel ground
Spec	Gap 0.7 mm
	heat range 7
	torque 23 Nm

Individual units

Nearby