Champion RC12ECC spark plugs

Frankm

Member
Joined
Nov 12, 2020
Messages
62
Location
Idaho
My 1999 4.0 Jeep TJ has the Champion plug RC12ECC right on the label under the hood. I ve been running these and typically change them at 40-50K miles and they still look great. Gap might grow a little but can’t see a change in engine performance or measurable mpg. Due for another plug change and just seeing if anyone has any new and improved recommendations before I get the plugs?

BTW I m the original owner and just crossed 200K and not one spark plug problem to date.

Thx for any comments or confirmations to stay with the same plugs.
 
I have used aftermarket double platinum plugs and aftermarket iridium plugs. I've switched back to the OE spec plugs. Just follow the factory recommended type and change interval. Plugs are inexpensive and easily changed. There isn't anything meaningful to be gained from a non-spec pkug on a stock engine.
 
Thx guys. Stock OE spec has worked fine to this point. No reason to solve a problem that aint there! Just thought ckg wouldn’t hurt! 👍