Would Like To Know The Best Spark Plugs That Will Deliver Mpg And Horsepower Performance For My Sahara 2008 Jk 3.8l V6. Have Read Many Articles On Bosch, Splitfire, E3.....etc. Does Anyone Have Advice And/or Experience With Different Brands?

 

This is a subject that has been previously and extensively discussed on the forum and the general consensus is that the OEM ones (or same brand purchased from your local parts supplier) provide the best performance, fewest problems, and cost savings.

 

I've used various brands and initially you feel that placebo effect but the reality is that stock plugs are the best. You're not going to see any HP or MPG gains from a plug in these vehicles. Go with smaller tires and you'll 'feel' more power and get more MPG's.

 

In my honest, and professional, opinion....
I prefer NGK platinum plugs. Theeee best plugs there are, again, just my opinion. (I am an ASE certified master tech, though). I've never had any issues with them, versus stock. I put them in everything, including my lawn mower...lol. For what it's worth....

 

I only use champion double platinum like the manual says and I replace plugs once a year. Definitely overkill but I can feel the difference in how it runs and I'm also sure a plug isn't going to get seized in there and cause an expensive repair. Once you have done it once it becomes a 45 min job taking your sweet time.

 

The factory spends a lot of cash to find a plug that works best for their set up, they want the best performance and fuel economy they can get out of a plug and found a good one, I recommend staying with the original, Ford, GM, Jeep, Mopar or what ever you drive

recertified ( 4 times) ASE master tech (with diesel) and GM 100% certified
tech, and all that BS that doesn't really mean anything other than I can pull on my boots and go take a test