Sir radz,choose the copper plugs. Replacing more often is more better than the iridium high life kuno that can be use for more thousand/s of kilometers. Pero manggugulo lang ng konti my APV consumes less fuel when I started to use iridium plugs.a difference of .5 - 1km to a liter. Kaso Iridium plugs cost around 2k per set unlike the copper plugs which is around 115 per piece sa suking auto supply.