Hi All, I like to replace 4 spark plugs on my 2000 Corolla. The only concern that I have is: in the owner manual, it states only using "iridium-tipped" plug which is very expensive compared with other type of plug, e.g., platinum. My corolla has already had 120K mile on it, I don't want to spend too much money, so is it a big problem using other cheap plug instead? Thanks. WM
- posted
19 years ago