Switching to Rotella 15w40
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 49
Likes: 0
From: Athens, Georgia
Year: 1996
Model: Cherokee
Engine: 4.0 Inline 6
Alright buddy you gonna help me out or be critical of my thread? everybody else is being helpful here bro. i realize 15w40 is plain old DIESEL oil thats fine thats why i asked before i went out and bought 6 quarts
Last edited by ACCoffroad; Apr 6, 2011 at 03:20 PM.
CF Veteran
Joined: Apr 2008
Posts: 13,952
Likes: 17
Model: Cherokee
This link will explain why Zinc is important in a new motor.
http://www.hotrod.com/techarticles/e...l_summary.html
As I stated earlier, if the motor has already been run or has any miles on it at all, there's simply no need to use a high zinc content oil. Either the damage is already done or thr the lifters and cam are already broken in and will not benefit enough from the zinc in the oil.
Run a conventional oil, a Conventional-Synthetic blend, or straight synthetic if you like.
http://www.hotrod.com/techarticles/e...l_summary.html
As I stated earlier, if the motor has already been run or has any miles on it at all, there's simply no need to use a high zinc content oil. Either the damage is already done or thr the lifters and cam are already broken in and will not benefit enough from the zinc in the oil.
Run a conventional oil, a Conventional-Synthetic blend, or straight synthetic if you like.
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 49
Likes: 0
From: Athens, Georgia
Year: 1996
Model: Cherokee
Engine: 4.0 Inline 6
This link will explain why Zinc is important in a new motor.
http://www.hotrod.com/techarticles/e...l_summary.html
As I stated earlier, if the motor has already been run or has any miles on it at all, there's simply no need to use a high zinc content oil. Either the damage is already done or thr the lifters and cam are already broken in and will not benefit enough from the zinc in the oil.
Run a conventional oil, a Conventional-Synthetic blend, or straight synthetic if you like.
http://www.hotrod.com/techarticles/e...l_summary.html
As I stated earlier, if the motor has already been run or has any miles on it at all, there's simply no need to use a high zinc content oil. Either the damage is already done or thr the lifters and cam are already broken in and will not benefit enough from the zinc in the oil.
Run a conventional oil, a Conventional-Synthetic blend, or straight synthetic if you like.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Seasoned Member
Joined: Jan 2011
Posts: 313
Likes: 0
From: Charlotte, NC
Year: 2001
Model: Cherokee
Engine: 4.0
I don't think you actually need something that heavy but I will say I bet you'll see some cooler operating temperatures. I use the Valvolines equivalent in my 500hp turbo 4cyl. but that's a different story obviously. I don't see why you NEED to go to it. If you're wanting something heavier just use a 40 weight. Regionally, where are you located?
I may be wrong but wouldn't a thicker oil cause increased temps and not lower temps since there is a higher fluid friction??
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 49
Likes: 0
From: Athens, Georgia
Year: 1996
Model: Cherokee
Engine: 4.0 Inline 6
Sorry, didn't mean to bunch up any panties. Here's some good reading http://www.bobistheoilguy.com/cms/in...d=84&Itemid=92. Afterwards, u may ask yourself, why would I use 15W40 in anything other than a lawnmower or a Harley. LOL
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 49
Likes: 0
From: Athens, Georgia
Year: 1996
Model: Cherokee
Engine: 4.0 Inline 6
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 49
Likes: 0
From: Athens, Georgia
Year: 1996
Model: Cherokee
Engine: 4.0 Inline 6
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
I'm not talking about BITOG.......read the papers written by Dr. A.E. Haas starting with Motor Oil 101.
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 49
Likes: 0
From: Athens, Georgia
Year: 1996
Model: Cherokee
Engine: 4.0 Inline 6
CF Veteran
Joined: May 2008
Posts: 2,495
Likes: 3
From: Edmond, OK
Year: 1993
Model: Cherokee
Engine: 4.0 ltr
I have been running the Rotella T 15w40 for awhile now and have not noticed any harm to my engine yet. During the winter months I might switch to a lighter weight Valvaline, but typically in the summer time I will run the Rotella.
I have also read that the zinc is better for the flat tappet 4.0 liter.
Even if the extra Zinc is not needed, the Rotella is usually a bit cheaper..
I have also read that the zinc is better for the flat tappet 4.0 liter.
Even if the extra Zinc is not needed, the Rotella is usually a bit cheaper..
Last edited by prerunner1982; Apr 6, 2011 at 04:06 PM.
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 49
Likes: 0
From: Athens, Georgia
Year: 1996
Model: Cherokee
Engine: 4.0 Inline 6
I have been running the Rotella T 15w40 for awhile now and have not noticed any harm to my engine yet. During the winter months I might switch to a lighter weight Valvaline, but typically in the summer time I will run the Rotella.
I have also read that the zinc is better for the flat tappet 4.0 liter.
Even if the extra Zinc is not needed, the Rotella is usually a bit cheaper..
I have also read that the zinc is better for the flat tappet 4.0 liter.
Even if the extra Zinc is not needed, the Rotella is usually a bit cheaper..
Member
Joined: Sep 2009
Posts: 150
Likes: 0
From: Albany/Saratoga, NY
Year: 1999 Stone White
Model: Cherokee
Engine: 4.0
I run RotellaT 15W-40 in the summer and Syn.Rotella 5W-40 in the winter. Seems like a great combo. My engine has quieted down and smoothed out quite a bit. Most of all it's cheap and available at every wally world. We basically run a truck engine, so treat it as such.