I have used Champion spark plugs in my civic, i bought it from plaza at Fair sale, there's no problem at all, after 25000km i replace another set of champion plugs, i notice these plugs runs outperform than NGK or others, even on CNG, accelartion also increase, actually every 1 have different opinion, bhai, akhir mechanical part may 100 may sy 1 problem to aie gee, these are excellent plugs i recommend.