Spark plug recomendation.

[JETSJEEP]

Looking to replace the factory plugs in a 2005 Wrangler 6 cylinder 4.0 with a better option. Trying to get a few more MPG. Any suggestions? Bosch? Thanks

 

[Jason4x4]

My '06 TJ with the 4.0 came with NGK V-Power plugs from the factory and I highly recommend them. Not that there's anything wrong with Bosch/Champion/Autolite/whatever, just that I've always seen great reliability and performance (and low cost) with the NGKs.

 

[Utah_jeepster]

Look for Diamond fire E3 spark plugs, PowerBlock/ Horsepower did a program on spark plugs and the Diamond fire plugs came out the best.
Didn't notice a big jump in my gas mileage, maybe a .5 improvement but I have gotten a better throttle response.