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 electrodes
, and the new design.