Great new spark plugs at a super price, they worked flawlessly as they did when I first put these in my 1993 Mazda Miata LE 20 years ago. The car now has 250,000 miles on it and still runs great! The secret is to run pure Synthetic in the total drive train and still change the oil at least ever 3000 miles no matter what, I don't care what people say these day with synthetic oil changes, 3000 miles is what's needed or less.