Ok, I searched but I didn't really find the answer I'm looking for. My '96 has 120k on it, I've owned it about 2 months and it runs well. Now, I plan on doing the Neon injector swap in the future(within 6 months but funds are tight right now) and I would like to increase my mileage a little bit (14 city, 18 hwy) so I'm wondering if a Seafoam treatment would help or if it's not really worth it at this point? If yes, then which one? Thanks guys, for a Jeep newbie like me this forum is amazing!

 

The short answer is YES. Regular, plain old Seafoam. There are various Seafoam products out there, but I've used just the regular stuff.

Seafoam is good for both:

1) Engines/crankcases, and

2) Fuel systems

I used a full bottle, last oil change on my '98. Put it in a week before the oil change. Seemed to be more gunk which flowed out of the pan than usual, come oil change time.

Previous oil change I put most of a bottle in the tank, and the rest in my lawn mower.

Both the '98 Cherokee and the lawn mower are running perfect. Jeep has close to 207K miles on the clock and runs great.

Two oil changes ago, I sprayed throttle body cleaner into the throttle body and IAC port on the inside. I'll most likely change out my original injectors by summer's end.

 

I did the seafoam thing on my 98 that has 120,000 on it. I did not notice a mpg difference. Now I did just use Gumout high mileage fuel additive that restores lost power and cleans valves. After running a tank of gas I increased my mpg by 1. That's my expirence, Good Luck