Best Oil Brand and weight for 4.0 - JeepForum.com
 1Likes
Reply
 
LinkBack Thread Tools
post #1 of 51 Old 04-27-2010, 06:25 PM Thread Starter
critmuncy99
Registered User
1998 XJ Cherokee 
 
Join Date: Apr 2010
Location: Kermit,Wv
Posts: 334
Best Oil Brand and weight for 4.0

Just got a XJ Cherokee today and it has 114k and needs a Oil Change just wondering whats the best for the 4.0. Thanks

critmuncy99 is offline  
Sponsored Links
Advertisement
 
post #2 of 51 Old 04-27-2010, 06:31 PM
limited
Registered User
 
limited's Avatar
1988 XJ Cherokee 
 
Join Date: Mar 2004
Location: West Seattle
Posts: 323
HAHA! Awesome! Welcome to the forum!

Seriously, do a search and you'll see what can of worms you opened starting a thread like this!

88 Pioneer
4.0 IL6
5 speed
misc. zip-strip mods
limited is offline  
post #3 of 51 Old 04-27-2010, 06:34 PM
escapeartist
Registered User
2000 XJ Cherokee 
 
Join Date: Jan 2009
Location: Fern Prarie, WA
Posts: 450
Welcome, and you may have well asked; whats the best beer? LOL

Those who say it cannot be done should be quiet and not interrupt those whom are doing it.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
escapeartist is offline  
 
post #4 of 51 Old 04-27-2010, 06:56 PM
Doitsouthstyle
Registered User
1996 XJ Cherokee 
 
Join Date: Nov 2008
Location: Baltimore
Posts: 160
10w-30 in weight
Doitsouthstyle is offline  
post #5 of 51 Old 04-27-2010, 07:25 PM
xjdude42
Registered User
1989 XJ Cherokee 
 
Join Date: Jul 2009
Location: Orange County
Posts: 178
I run a Wix filter and Rotella T 15-40 oil on mine...118000 miles.
xjdude42 is offline  
post #6 of 51 Old 04-27-2010, 07:31 PM
Spencer43783
Registered User
1998 XJ Cherokee 
 
Join Date: Feb 2010
Location: Heath
Posts: 649
I'd run a high-mileage of whatever you get. Any major oil brand is good. Valvoline, Castrol, or Pennzoil will work just fine. I've used all three without any problems. High mileage oils have more additives in them which helps recondition your seals. But I wouldn't do full synthetics, they run smoother/thinner. Which could make any leaks you have, worse. However if it was a new vehicle, I'd run full synthetics or blends, that is if you can afford them lol. Just my opinion on synthetics.

For weight, like Doitsouthstyle said, 10w-30 is good. You CAN go to a heavier weight if your engine leaks bad, to like a 10w-40 or 20w-50 but that's another can of worms. I'd stick with 10w-30 and let it leak :-D

As far as filters I'd stay away from cheapo Wal-Mart ones like Fram. If you want a good filter go with Amsoil. They also make Wix. And Wix is the supplier for Napa. The only place I know of that you can get Amsoil products is Jegs and like I said, Napa.

A lot of people that take good care of their cars swear by Amsoil products.

And limited is right, BIG can of worms because a lot of people swear by Fram. It's amazing what advertising and some grippy stuff on an oil filter will do! Haha but it's all up to you, this is just my honest opinion :-)

1998 Cherokee Sport 4.0L-AW4-NP231-C8.25--Black, trim removed and chopped. 31" Goodyear Wrangler Duratracs. 3" lift coming soon.
1984 Grand Wagoneer--Sold. I'll miss the old girl.
Spencer43783 is offline  
post #7 of 51 Old 04-27-2010, 07:31 PM
silver60th
Registered User
2001 XJ Cherokee 
 
Join Date: Nov 2008
Location: Lubbock
Posts: 376
Run almost any filter but Fram, and run a 10/30 or 15/40 oil, preferably something
made for a diesel engine with a ZDDP additive.

I personally run a Purolator filter with Delo 15/40
silver60th is offline  
post #8 of 51 Old 04-27-2010, 07:43 PM
toates89
Registered User
1989 XJ Cherokee 
 
Join Date: Jan 2006
Location: long island
Posts: 2,190
i been reading that diesel oil is better. some one save me some time is this true or not?
toates89 is offline  
post #9 of 51 Old 04-27-2010, 08:09 PM
Spencer43783
Registered User
1998 XJ Cherokee 
 
Join Date: Feb 2010
Location: Heath
Posts: 649
Diesel oil? Hmm that is interesting, someone should enlighten us both :-D

1998 Cherokee Sport 4.0L-AW4-NP231-C8.25--Black, trim removed and chopped. 31" Goodyear Wrangler Duratracs. 3" lift coming soon.
1984 Grand Wagoneer--Sold. I'll miss the old girl.
Spencer43783 is offline  
post #10 of 51 Old 04-27-2010, 08:13 PM
djb383
Registered User
1998 XJ Cherokee 
 
Join Date: Jan 2010
Location: The Republic of TEXAS
Posts: 2,200
Didn't even make 10 posts, in this thread, and the motor oil myths have started. LOL
Mark-318-IT likes this.
djb383 is offline  
post #11 of 51 Old 04-27-2010, 08:19 PM
sxshep
Registered User
2000 XJ Cherokee 
 
Join Date: Nov 2009
Location: SW Ohio
Posts: 167
I just changed mine with 10w-30 Castrol High Mileage (I have 158k on mine)... I've used it on my S14 with stock KA24DE engine with 150k too and it was fine. I wouldn't be running full synthetic either, you'll probably find soem more leaks pretty quick with thinner oil.

Also depends on your climate and where you're located.... If WV is anything like SW Ohio, I'd just run 10w-30 all year round.
sxshep is offline  
post #12 of 51 Old 04-27-2010, 08:34 PM Thread Starter
critmuncy99
Registered User
1998 XJ Cherokee 
 
Join Date: Apr 2010
Location: Kermit,Wv
Posts: 334
I think im gonna go with 10w40 castrol high mileage ..When cold weather rolls around go with the 10w30..I like a little thicker oil for the hot weather just for the extra protection..
critmuncy99 is offline  
post #13 of 51 Old 04-27-2010, 08:42 PM
Spencer43783
Registered User
1998 XJ Cherokee 
 
Join Date: Feb 2010
Location: Heath
Posts: 649
Sounds good! :-)
Since you just bought it don't forget to check all your filters, fluids and spark related things!
Tranny, diffs, transfer case, fuel filter, air filter, plugs, wires, etc :-) I can't wait to get my Jeep! It's gonna be spoiled lol

1998 Cherokee Sport 4.0L-AW4-NP231-C8.25--Black, trim removed and chopped. 31" Goodyear Wrangler Duratracs. 3" lift coming soon.
1984 Grand Wagoneer--Sold. I'll miss the old girl.
Spencer43783 is offline  
post #14 of 51 Old 04-27-2010, 08:45 PM
djb383
Registered User
1998 XJ Cherokee 
 
Join Date: Jan 2010
Location: The Republic of TEXAS
Posts: 2,200
Quote:
Originally Posted by Spencer43783 View Post
Diesel oil? Hmm that is interesting, someone should enlighten us both :-D
Diesel engine motor oils are loaded with additives to enable the oil to withstand the thrashing of a 25:1 turbocharged compression ratio. The XJ 4.0 has a wimpy 8.8:1 compression ratio by comparison. Most diesel motor oils are thicker than necessary for the Jeep 4.0, especially with regard to the low/1st number. However, Shell Rotella is offered in a 5W40 synthetic. I'm not recommending useing diesel motor oil in the XJ but can't see it possibly hurting anything, especially in a warm/hot climate.
djb383 is offline  
post #15 of 51 Old 04-27-2010, 08:57 PM
FairlanePhil
Registered User
 
FairlanePhil's Avatar
1999 XJ Cherokee 
 
Join Date: Feb 2010
Location: Toledo Ohio
Posts: 3,190
I pretty much live on the big block ford forum. They too beat oil to death as a topic but most of those guys are building jetboats and 9 sec cars. I tend to listen to them as there are a lot of flat tappet cam guys on there.
I paid heavy in blowing off some stuff i read on there when I 1st got into messing with motors.

I ran straight 10W 30 to break in my 466's cam.

I wiped 3 lobes
Worse yet the piece of **** Fram filter I had was a bypass type.
It opened up and dumped metal through the whole new engine.

Buy the performance K and N, Motorcraft or Mopar filters.

I used to run Shell Rotella T 20W 50 for the Zinc and ZDDP lubricants but Rotella
was reformulated a couple years back. In all my flat tappet cars I want to keep
I run Valvoline race 20W 50.

Now the Jeep, I'm not sure what to run in it. It has some diesel like clatter to it that I assume is valvetrain but is probably piston slap. I have good oil pressure so I plan to ignore it and use the VR in a lighter weight.

Also I have a sludge filled F 150 with a rod knock and 8psi of oil at hot idle.
I used 10W 40 and Lucas. Ive never used any additives (except GM EOS for the zinc during a cam break in) but the Lucas is giving me 30psi hot idle and quieted the engine considerably

That's just my exp with oils

Current: 99XJ 6.5 lift-Bought 2015
Sold: Patriot Blue 00 XJ.
'sploded: 01 stock-0331 head victim
FairlanePhil is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
8.25 weight cgmrdc XJ Cherokee Technical Forum 1 02-03-2009 10:06 AM
Weight of xj ??? Gsmyth75 XJ Cherokee Technical Forum 21 05-14-2007 08:35 PM
4.0L Weight? projectXJ XJ Cherokee Technical Forum 18 10-10-2006 05:48 PM
How much weight is to much? UTHornsFan XJ Cherokee Technical Forum 8 07-05-2006 07:48 PM
What Oil Weight should I / do you Use? chow XJ Cherokee Technical Forum 7 09-20-2004 08:14 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome