spark plug brand

i know copper core is preferred for these engines, any particular brand? i know the 4.0 in my cherokee likes champion or NGK. Any preferred brand for the 3.7?
thanks

I have used the NGK's with no issues. (OEM copper core ones) The # escapes me but is listed on your emissions sticker under the hood along with the gap. They will need to be changed every 30K or so. At least mine had the gaps spread a lot when I checked them at 30K. Some have used the Autolite platinum with good results.

Dave

I used the Autolite Plats on mine. No issues whatsoever.

I have fine-wire Bosch in mine and it passed the 40k mi checkup with no wear.

wheeee32 said:

I used the Autolite Plats on mine. No issues whatsoever.

Click to expand...

Me too.

OEM copper core.

bought champion copper cores today, will install them saturday along with new axle gear oil