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-   -   4.0 91oct Tune Sparkplugs (http://www.jeepgarage.org/f196/4-0-91oct-tune-sparkplugs-10283.html)

SRTWJ04 06-13-2010 05:57 PM

4.0 91oct Tune Sparkplugs
 
Which do you guys recommend? I was going to get Bosch but i heard those are just not worth the money. Any solid recommendations? thanks

Chaoul1 06-13-2010 07:55 PM

Re: 4.0 91oct Tune Sparkplugs
 
Get OEM ones. Don't get anything else. Trust me.

SRTWJ04 06-14-2010 08:55 PM

Re: 4.0 91oct Tune Sparkplugs
 
Really? thats surprising, thank you though

Scottina06 06-14-2010 09:01 PM

Re: 4.0 91oct Tune Sparkplugs
 
unless you are going nitrous or F/I....the stockers work the best on the 4.7 type engine

Joe in PA 06-14-2010 09:37 PM

Re: 4.0 91oct Tune Sparkplugs
 
This isn't a 4.7L engine he is asking about, it is a 4.0L. The oft stated claim that only oem are acceptable in any Jeep engine is a load of bull. I have run ngk copper plugs in both 4.0L and 4.7L Jeep engines for hundreds of thousands of miles without a single issue. Have also run non oem plugs in a 4.7L HO engine, though they weren't copper. Even running 16 NGK copper plugs in a 5.7L hemi right now with zero issues.

Mopar doesn't make spark plugs and there is no reason to purchase plugs at a stealership. Go to the local auto parts place and get a set of ngk or champion copper plugs, install them in the 4.0L and never look back! ;) Chances are you will get the exact same plug you would have purchased from mopar for less money.

SRTWJ04 06-19-2010 09:18 AM

Re: 4.0 91oct Tune Sparkplugs
 
sweet! thanks Joe in PA!

robpp 06-19-2010 09:24 AM

Re: 4.0 91oct Tune Sparkplugs
 
i have a 4.0 with 128K I have used the autolite double platinums the last 2 changes. I still get 20MPG on the highway.


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