spark plug e3

When the Splitfires first came out, I was given a set. I put them in a 1973 Ford Maverick that burned oil and fouled the Autolites about every 1-2 weeks before I pulled them out and cleaned them. The Splitfires would last almost a month before knocking the burned oil off. Other then that, I noticed no difference.

If you ever changed the plugs on the old Mazda RX7s, you have seen the NGKs with the multiple electrodesimages?q=tbn:ANd9GcQJVIJO_oPQmAttwVj1HMS1xk8p7k5Sl-p6jIx6t0Kkiny8OFSE.jpg , and the new design.rx7_sp_6.jpg