Bosch Double Platinum Plugs after 20K miles

[John Scoggins]

Never really liked any plug by Bosch, here is a pic of the 6 "Double Platinum" plugs the PO installed that have ~ 20K miles on them (according to the records that came with the Jeep). They sure did not last very long, the gaps run from .040" to >.085". Went back with Autolite and I bet the current 9MPG goes up and the pending cylinder 3 misfire code will stop showing up as well.
And the crap in the thread was addressed also.

 

[InOmaha]

Wow, three of those are worn enough they don't even look like the same plug.

 

[John Scoggins]

Wow, three of those are worn enough they don't even look like the same plug.

I know, when I pulled the first plug that had a big gap (#2 cylinder) I though the same thing but the part number on all the plugs is the same.