Plugs easy to replace: factory-pre-set electrode gap, no adjustment necessary; Bosch advices not to lubricate the thread, Requested tightening torque or angle see on package High reliability: Outstanding protection against carbon fouling due to surface air-gap technology High wear resistance and robustness: special ceramic material with high dielectric and mechanical strength Supports an optimum engine performance: smooth engine operation and steady acceleration Corrosion protection: outstanding engine protection due to anti-seize nickel-plated housing and thread Please use the vehicle identification to confirm compatibility with your vehicle, All restrictions must be observed