SET OF 12 PERFORMANCE SPARK PLUG Mercedes S600 6.0L Coupe with M 120.980-982 engine serial nr. (1996-1993) * 66IP1DOR15LGSL98VB4 1. Higher HP and torque by up to 3 % 2. increased economy by up to 5% 3. 360 Firing Technology 4. Improved acceleration by up to 15 % 5. 25,000 miles - 40,000 km duration