The best Spark plugs?
The best Spark plugs?
CF Veteran
Joined: Oct 2011
Posts: 1,394
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From: SEMO
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0 L6
I prefer NGK, so I use the ZFR5N plugs, but I can't say they perform better than the factory recommended Champion RC12LYC.
Whatever you decide, just use a standard, no-frills copper plug and don't fall for the gimmicks.
Whatever you decide, just use a standard, no-frills copper plug and don't fall for the gimmicks.
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Newbie
Joined: May 2018
Posts: 29
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Year: 1988
Model: Cherokee (XJ)
Engine: 2.5 Litre
Thanks for your comment, indeed i saw a lot of comments about use platinum or iridium so i was confused.
CF Veteran
Joined: Oct 2013
Posts: 2,097
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From: Tarpon Springs, FL / Denver, CO
Year: '98
Engine: 4.0 I6
I also switched to NGK from Champion.
They are made in Japan or USA and are generally higher quality than the Champions (though I have never had any issues with the Champions).
Runs just fine with the ZFR5N plugs I have in my 98.
More important is re-gapping the plugs every 25k miles, and replacing them every 40k miles or so
They are made in Japan or USA and are generally higher quality than the Champions (though I have never had any issues with the Champions).
Runs just fine with the ZFR5N plugs I have in my 98.
More important is re-gapping the plugs every 25k miles, and replacing them every 40k miles or so
Thread Starter
Newbie
Joined: May 2018
Posts: 29
Likes: 0
Year: 1988
Model: Cherokee (XJ)
Engine: 2.5 Litre
I also switched to NGK from Champion.
They are made in Japan or USA and are generally higher quality than the Champions (though I have never had any issues with the Champions).
Runs just fine with the ZFR5N plugs I have in my 98.
More important is re-gapping the plugs every 25k miles, and replacing them every 40k miles or so
They are made in Japan or USA and are generally higher quality than the Champions (though I have never had any issues with the Champions).
Runs just fine with the ZFR5N plugs I have in my 98.
More important is re-gapping the plugs every 25k miles, and replacing them every 40k miles or so
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CF Veteran
Joined: Oct 2011
Posts: 1,394
Likes: 8
From: SEMO
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0 L6
From CCKen:
A word or two about NGK & Champion plugs:
If you go to the NGK website and look up NGK plugs for your Jeep you will find that they list ZFR5N plugs for 1999 - 2001 Jeeps w/4.0 motors.
If you have an earlier Jeep (<99) you will see they list a FR5-1 plug. That is the wrong plug for your Jeep. FR5-1 plugs are for Chrysler and Dodge V8's.
You can use ZFR5N plugs in earlier 4.0's with no problem, as well as the Champion RC12LYC plugs. The ZFR5N plug is almost the same as Champion RC12ECC plug, the only difference being is the ZFR5N plug has a slightly cooler heat range than the RC12ECC plug. The RC12ECC plug is identical to the RC12LYC plug in having he same heat range, except that the RC12ECC plug has an improved design over the RC12LYC. Note the "CC" at the end of the RC12ECC plug number. This means Copper Copper. Copper Copper plugs have Nickle plated Copper ground electrodes and Nickle plated Copper center electrodes.
If you go to the NGK website and look up NGK plugs for your Jeep you will find that they list ZFR5N plugs for 1999 - 2001 Jeeps w/4.0 motors.
If you have an earlier Jeep (<99) you will see they list a FR5-1 plug. That is the wrong plug for your Jeep. FR5-1 plugs are for Chrysler and Dodge V8's.
You can use ZFR5N plugs in earlier 4.0's with no problem, as well as the Champion RC12LYC plugs. The ZFR5N plug is almost the same as Champion RC12ECC plug, the only difference being is the ZFR5N plug has a slightly cooler heat range than the RC12ECC plug. The RC12ECC plug is identical to the RC12LYC plug in having he same heat range, except that the RC12ECC plug has an improved design over the RC12LYC. Note the "CC" at the end of the RC12ECC plug number. This means Copper Copper. Copper Copper plugs have Nickle plated Copper ground electrodes and Nickle plated Copper center electrodes.
CF Veteran
Joined: Oct 2011
Posts: 1,394
Likes: 8
From: SEMO
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0 L6
Thread Starter
Newbie
Joined: May 2018
Posts: 29
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Year: 1988
Model: Cherokee (XJ)
Engine: 2.5 Litre
CF Veteran
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From: WV
Year: '96
Model: Cherokee
Thread Starter
Newbie
Joined: May 2018
Posts: 29
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Year: 1988
Model: Cherokee (XJ)
Engine: 2.5 Litre
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