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The Original 3/8" Ruffstuff Diff Cover!Ruffstuff Axle Simple Swap Kit!The Ruffstuff NOT Universal 4 Link Kit!

Unread 12-21-2010, 10:50 AM   #1
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2008 KK Liberty 
Join Date: Sep 2009
Location: San Carlos, CA
Posts: 29
Spark Plugs

What brand of spark plugs are good to use? How often should they be changed? I have the NGK iridium IX in my liberty currently and i'm coming up on 30k miles.

UPDATE: I have an 08 Libby

Last edited by KISSlover101; 12-21-2010 at 01:53 PM..
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Unread 12-21-2010, 01:03 PM   #2
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1986 MJ Comanche 
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Location: Warner Robins, Georgia, Georgia
Posts: 1,982
regular champion plugs are perfect for a Jeep. nothing fancy or NASCAR quality, leave that to crappy Hummers
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'86 MJ XLS 4x4 2.8L 3spd longbed buckets
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Unread 12-21-2010, 02:20 PM   #3
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2008 KK Liberty 
Join Date: Mar 2009
Location: Stoneham, Massachusetts
Posts: 944
The spark plugs are NGK ZFR6F-11G 6987. NGK (6987) ZFR6F-11G V-Power Spark Plug, Pack of 1: Automotive . These are what i used, i only stick with OEM on the spark plugs, its not worth buying the expensive ones.
2008 KK Liberty
Inferno Red
Daystar 2" Spacer Lift With SkyJacker Hydro Shocks
JBA Gen 5.5 Upper Control Arms
Rokmen Riddler 8.25 Differential Cover
2 KC Slimlite 100 Watt Driving Lights on JK Light Bar
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Unread 12-21-2010, 02:29 PM   #4
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2008 KK Liberty 
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Location: Florida
Posts: 1,442
The stock NGK are what I use. stay way from ac delco

Don't forget to service the transmission and Differential.
2008 Sport Liberty
Cold air intake*Trush (magnaflow) turbo muffler* Hypertech power program*
Hood Prop mod. Battery Quick Release mod.
Resonator removed (sounds like a V8 on start up)
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Unread 12-27-2010, 09:23 AM   #5
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2008 KK Liberty 
Join Date: Nov 2010
Location: Ashburn, VA
Posts: 10
I also use the stock NGK plugs. I've changed them twice already at 30K and 60K without any problems and the all the plugs have worked great as far as I can tell. No need to pay extra for anything else.
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