Hi guys,
I was on leave today so went Jalan Jalan around some of the car workshops. I was in this workshop and was contemplating on where to change my current stock spark plugs to the Denso Iridium one. I asked one of the guys in the workshop of which Denso spark plug can the Optra use and he told me can use the IK16 one. I asked him about the IK20 one and he told me IK20 for above 1.6L car and IK16 for 1.6L and below car. I am not sure if he is right or not. Anyone can shed some light on this matter?
Also, between Denso and NGK iridium spark plug which is better?