My 91 cherokee with the 4.0 has almost 260,000 miles on it.The engine runs good but there is sludge buildup.The person I sold my GMC to reccomended that i buy this stuff called motor flush.Has anyone on this forum used this before?

 

Have you tried running some seafoam through it yet?

 

Seafoam

 

http://www.seafoamsales.com/motorTuneUp.htm

Many use it and claim it works wonders, that said I have never used it myself.

 

Thanks for the link

 

I would try that before anything, many people have good success with that particular product.

 

Diesel and kerosene or also great one. I have seafoamed both my Renixes. But didnt do too much. Try Diesel only a quart for 15 min. then drain and change filter

 

Yup, I`ve heard that`s pretty good stuff, but like Kyle, I have never used it, but have talked with friends that have,

 

Ive done similar...

But I drain the oil, screw on an El-cheap filter... Pour in a gallon of diesel. Run it 15 minutes, drain it, put on a good filter, refill with good oil... Works like a champ...

 

I have also done this with a combo of 2qts kerosene to 4 qts of 30 wt oil. Run for 15 mins at idle then drain and change to straight 30 wt for another 15 mins. Drain and put whatever you want to end up with for oil and filter.

Did this on a flathead plymouth and then drove it from Chicago to Maryland. Great car. They just don't make cars like that any more.

 

Yeah we finally have a good use of a FRAM filter

 

Fram is an excellent filter for this purpose but the store brands are usually cheaper and do as well as a Fram. The diesel/kerosene flush always works but if your engine was on it's last legs then it will knock those legs out from under it. So be aware!!!! But it will be cleaned out when you do the rebuild. Have to look for the silver lining to every dark cloud.

 

Really well i guess my Renix has a couple legs left... YEAH

 

Did it on my first Renix era Jeep an '89 and it had 248,000 showing and the odometer didn't work any longer. About 6 months after the flush I started getting lower oil pressure at idle down to less than 5 pounds. Tore the engine down and built a stroker that went into a buddies CJ7 that was a good engine but the diminished oil pressure was a concern. But with the stroker build we changed cranks anyway, so no big deal. Only took ten over bearings anyways. When I left Georgia that Renix was still tearing up the hunting lease in that CJ7. So that is my only disclaimer experience/

 

I guess when I think about it, diesel is really is a solvent. Shouldn`t be any reason why that wouldn`t work. Matter of fact, I like that idea.
and you are right blue,, I had an old valient with a slant 6,, tried to blow it up on the freeway once,, valves just started floating till the rpms came down a little.