Been using BRISK QR12LS Silver spark plug in my Thar 4x4 Automatic for 18 months. My SUV runs smoother than before, have driven 20k km on them and are still going strong. No other brand offers the perfect match for the DI engine with colder specs and Silver electrode which is the better than Iridium. I first bought NGK from aftermarket which someone sold me a hotter plug which was used in i20 which created so many problems then i came across BRISK,