Sep 21, 2015, 03:49 PM
Last edit by: IB Advertising
See related guides and technical advice from our community experts:
Browse all: General Overview
- Jeep Grand Cherokee WJ 1999 to 2004 Crash Test and Safety Ratings
Important Information to help you understand your Jeep Grand Cherokee.
Browse all: General Overview
XJ Ask the Question Thread
CF Veteran
Joined: Sep 2010
Posts: 12,692
Likes: 6
From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
I hate getting into this discussion, because everyone seems passionate about their own opinion. Not everyone can be right.
That said, my understanding of synthetic oils is thus: if you have existing leaks with conventional oil (including small unnoticed ones) they will get worse on a swap to synthetic because the same weight synthetic is "slipperier" than it's conventional counterpart. More slippery in this case means more likely to go through the gaps in the seals. If you don't have any leaks (you probably don't actually own a jeep) you're great because the synthetic is better for the engine than the conventional oil. Just be prepared to fix that leak you've been ignoring or didn't notice.
Now that I've made that statement, let me make another disclaimer. From what I can tell, very few people outside of the community that designs oil truly understand how it works. (meaning the scientists that create it and the engineers that design the engines) Everyone else has their own opinion that may or may not be true.
Let the tearing apart of my post begin!
That said, my understanding of synthetic oils is thus: if you have existing leaks with conventional oil (including small unnoticed ones) they will get worse on a swap to synthetic because the same weight synthetic is "slipperier" than it's conventional counterpart. More slippery in this case means more likely to go through the gaps in the seals. If you don't have any leaks (you probably don't actually own a jeep) you're great because the synthetic is better for the engine than the conventional oil. Just be prepared to fix that leak you've been ignoring or didn't notice.
Now that I've made that statement, let me make another disclaimer. From what I can tell, very few people outside of the community that designs oil truly understand how it works. (meaning the scientists that create it and the engineers that design the engines) Everyone else has their own opinion that may or may not be true.
Let the tearing apart of my post begin!
Get back on topic. Leave the oil threads for the oil threads
Beach Bum
Joined: Jul 2011
Posts: 6,123
Likes: 22
From: Cape Hatteras, North Carolina
Year: 2000 WJ
Model: Grand Cherokee
Engine: 4.0
Emergency Stop
After a lifting and aligning, adding tires & armor. Who tests for an emergency stop from around 35-40 mph?
I like to do it to see how the jeep will react, which tire/tires lock up, which direction it pulls and how hard, what breaks/falls off,etc...
I like to do it to see how the jeep will react, which tire/tires lock up, which direction it pulls and how hard, what breaks/falls off,etc...
CF Veteran
Joined: May 2010
Posts: 1,187
Likes: 33
From: Boston
Year: 2000
Engine: 4.7L
Cruel buzzard! Kicking a guy when he's down...
I plan to continue searching for my next square-okee while driving this '05 Subaru Baja. Who knows, maybe I'll find a gem like my old friend (may it rest in pieces).
I plan to continue searching for my next square-okee while driving this '05 Subaru Baja. Who knows, maybe I'll find a gem like my old friend (may it rest in pieces).
Seasoned Member
Joined: Sep 2011
Posts: 464
Likes: 0
From: Muncie, Indiana
Year: 1998
Model: Cherokee
Engine: 4.0
So my 4.0 is leaking oil on the hex shaped adapter that the oil pressure sending unit attaches to the engine block. Is there a gasket between the hex adapter and the engine block? The sending unit itself is not leaking, or the o rings for the oil filter adapter. Hope this makes sense...
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
So my 4.0 is leaking oil on the hex shaped adapter that the oil pressure sending unit attaches to the engine block. Is there a gasket between the hex adapter and the engine block? The sending unit itself is not leaking, or the o rings for the oil filter adapter. Hope this makes sense...
Seasoned Member
Joined: Sep 2011
Posts: 464
Likes: 0
From: Muncie, Indiana
Year: 1998
Model: Cherokee
Engine: 4.0
Oil filter adapter. Get the O-ring kit from the stealership, and figure out if you have the Torx T-60 or the 14mm (9/16") Allen key bolt. I have the 14mm hex on mine, and I used a coupling (extra long nut) with a 14mm outer diameter. I put a socket on that, and used a breaker bar. Easy peasy.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
#2 Permatex to seal the pipe threads and you'll be fine. Clean everything up real good first.
Seasoned Member
Joined: Sep 2011
Posts: 464
Likes: 0
From: Muncie, Indiana
Year: 1998
Model: Cherokee
Engine: 4.0
Seasoned Member
Joined: Sep 2011
Posts: 464
Likes: 0
From: Muncie, Indiana
Year: 1998
Model: Cherokee
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Junior Member
Joined: Feb 2014
Posts: 88
Likes: 1
From: Washington
Year: 1990
Model: Cherokee
Engine: 4.0
Necessary?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?
Last edited by GreatPumpkin; Apr 24, 2014 at 08:49 PM.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Necessary?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?
Edit: Obviously not, as it runs without it. Now that you identified it, (Thank you!) I was able to find/read quite a few threads on it. So basically my injectors are batch firing without it instead of sequentially like they would if they were getting a signal from the sync generator. Should I even bother trying to hook it back up?