Beru Spark Plug The Beru copper core spark plug is OEM Quality and is guaranteed to meet or exceed the vehicle manufacturers specifications for performance and durability.Technical Features Optimal combustion: saves fuel and protects the catalytic converter. Reliable ignition under all operating conditions. Long life, high dependability. Two-component earth and centre electrode with nickel-jacketed copper core. Replacement versions same as OEM.Beru offers a wide range of quality spark plugs for a large number of different engines and applications, these spark plugs are also often used in OEM. This guarantees a high quality level and innovative technology.Warranty Information: 12 month - 12,000 mile limited warranty against defects in material and workmanship. BERU 12ZR6SP02.BERU is the leading brand of diesel cold-start systems with an estimated world-wide market share of almost half of the worlds glow plugs