Mercedes-Benz Nickel Alloy Spark Plug A0041591303 ILFR6A 3588 Stable Ignition

Mercedes-Benz C-Class, E-Class, S-Class and ML-series (from 2000) nickel alloy spark plug A0041591303/ILFR6A 3588; installed in cylinder head threads; generates high-voltage spark at top dead center to ensure smooth operation. Installation difficulty medium; 0.5–1 hour depending on cylinder count. Idle jitter, acceleration weakness, higher fuel consumption, or starting difficulties indicate electrode wear or heavy carbon buildup; replace promptly.