What is a good oil to run in a straight 6 motor in a 4x4 Cherokee? Is synthetic good? What weight?

 

Do a search on the forum. This has been discussed more than enough times. Your sure to find the answers you want

 

People tend to stay away from the oil arguments because there's more Than enough of them already.

 

DO A SEARCH!!!

 

Man y'all are big help. Thanks guys

 

if searching gets you know where. try rottella hd 15w-40.

 

All the search replies could have just answered, guys new, suggest search but help out.

I will never put synthetic in an engine that has more then 50k miles, sometimes no big deal but ive seen three engines fail right after switching from std oil. It has alot of cleaners in it that can clean out thinngs that are now "part of" your engine or gaskets. Reg oil is fine just change every 3-5k based on how hard you use your.

 

Bobistheoilguy.com

Great information.

As far as older engines failing when introduced to synthetics, I can't dispute that they failed. But the engine was already worn, and no build up or deposit left by conventional oil will withstand much wear. Especially if a simple change in detergents 'washed' them out. Again, I wasn't there, but synthetic oil has every advantage over conventional. It cools better, maintains it's viscosity, and most importantly, shortens the time it takes for a cold engine to be lubricated. Thats where 90% of engine wear occurs.
My .02£

 

And I am being totally serious. You don't want an explosion of opinions, madness, and flames? Then search and get quick info. If I tried to bring up a link for every oil thread regarding the Jeep 4.0 in existance, it would likely crash the site. If you cannot search, click this link:

http://lmgtfy.com/?q=Jeep+Cherokee+oil+type

 

I agree rotella or 20 50 and not a fram filter than tend to clog. Lots of bad reviews on those

 

Everything in me says the same thing but thats what happen ive had guys tell me same thing about changing tranny fluid after 100k if it was never changed, who knows. I always ran mobil 1 in my srt-4 it used to be alot cheaper haha

 

That's all old wives tales.

Falls into the category of "Those who haven't done it are telling those of us who have done it, that it can't be done."

 

Ive seen it happen, come to think of it my first car (87 lesabre) had trans fail after i had it flushed and refill only one day later. The engine thing, my friend changed to mobil one on his 80s jeep and that same day engine failed, if i hadnt seen it happen i wouldnt think there was any truth to it.must be a one in a million thing im just real lucky

 

Either that or you're an old wife............LOL.

 

Theres a fresh post in this section of forum about trans slip after flush fill. I guess im not the only one.