This was from a '94 Jeep Grand Cherokee with a 4.0 running Mobil brand gasoline with Supertech brand 2 stroke oil mixed at 300:1. There are only two tanks worth from another station (BP).
A little more than 30K on these plugs, Champion Copper Plus. Stock gap spec is .035, all six wore down to .040. Electrodes appeared ok with exception of rounded edges. These plugs have seen a large amount of idle time.
My only worry is that the cyl#2 plug has light black build up on the lower portion of the ceramic. Nothing heavy or flaky, but am wondering if this may be a cause to some slight tick I hear at warmup.
I would have flattened and re-gaped but they are cheap and Champion offers a 2yr/unlimited mile warranty on new ones.
cyl1
cyl2
cyl3
cyl4
cyl5
cyl6
A little more than 30K on these plugs, Champion Copper Plus. Stock gap spec is .035, all six wore down to .040. Electrodes appeared ok with exception of rounded edges. These plugs have seen a large amount of idle time.
My only worry is that the cyl#2 plug has light black build up on the lower portion of the ceramic. Nothing heavy or flaky, but am wondering if this may be a cause to some slight tick I hear at warmup.
I would have flattened and re-gaped but they are cheap and Champion offers a 2yr/unlimited mile warranty on new ones.
cyl1
cyl2
cyl3
cyl4
cyl5
cyl6