99 TJ Owners Manual question: Oil - JeepForum.com
 8Likes
Reply
 
LinkBack Thread Tools
post #1 of 20 Old 09-20-2017, 07:14 PM Thread Starter
jeepsgotnutz
Registered User
1999 TJ Wrangler 
 
Join Date: Feb 2005
Location: United States of Texas
Posts: 148
99 TJ Owners Manual question: Oil

Misplaced the owners manual. Dealer put in a different grade of oil than normal.


Need to know what weight oil the owners manual calls for.


You can't have Manslaughter without Laughter

I was sad because I had no shoes, until a I met a man with no feet. So I said to the man, "Got any shoes you're not using?"
jeepsgotnutz is offline  
Sponsored Links
Advertisement
 
post #2 of 20 Old 09-20-2017, 07:56 PM
zipman35
Registered User
2005 TJ Wrangler 
 
Join Date: Mar 2017
Posts: 38
Look like 10w30

https://***************.com/attachme...ual-pdf.14034/


Sent from my iPhone using Tapatalk
zipman35 is offline  
post #3 of 20 Old 09-21-2017, 07:02 PM
SerenityJeepTJ
Registered User
1997 TJ Wrangler 
 
Join Date: Sep 2017
Location: El Paso
Posts: 5
Garage
5W30

"What we think, we become." Buddha
SerenityJeepTJ is offline  
 
post #4 of 20 Old 09-21-2017, 08:04 PM
2jhanna
Web Wheeler
2002 TJ Wrangler 
 
Join Date: Jun 2007
Location: Denton County, TX
Posts: 8,006
Quote:
Originally Posted by SerenityJeepTJ View Post
5W30
Where did you get this from?



Use 6qts of 10/30, brand not that important.

jhanna
denton county, tx
2jhanna is offline  
post #5 of 20 Old 09-21-2017, 08:10 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 69,063
Quote:
Originally Posted by 2jhanna View Post
Where did you get this from?
My owners manual lists both 5W-30 and 10W-30. I'm thinking of switching to 5W-30 since it flows throughout the engine more quickly and easily when cold. Both of course are 30 weight viscosities when up to temperature.
arg0413 likes this.

When you have a choice, buy American made.
Jerry Bransford is offline  
post #6 of 20 Old 09-21-2017, 08:17 PM
2jhanna
Web Wheeler
2002 TJ Wrangler 
 
Join Date: Jun 2007
Location: Denton County, TX
Posts: 8,006
My manual states 10/30 preferred, and shows a chart where 10/30 covers from 0 degrees to over 100degrees.

And 5/30 covers from 32 degrees to below -20 degrees.

The OP did ask what the manual stated.

Now we all know we are splitting hairs here and to the OP, if the shop put anything from 5/30 to 10/40, I wouldn't be to worried here in Texas.

jhanna
denton county, tx
2jhanna is offline  
post #7 of 20 Old 09-21-2017, 09:16 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 69,063
Quote:
Originally Posted by 2jhanna View Post
My manual states 10/30 preferred, and shows a chart where 10/30 covers from 0 degrees to over 100degrees.

And 5/30 covers from 32 degrees to below -20 degrees.... (and to over 100 degrees as well.)
Clarified.

When you have a choice, buy American made.
Jerry Bransford is offline  
post #8 of 20 Old 09-21-2017, 09:31 PM
mukluk
Registered User
2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde
Posts: 2,582
Further clarification...

My 2000 owner's manual shows 5W-30 as acceptable for temps 100F and cooler, but the 2005 owner's manual shows 5W-30 acceptable only for temps below freezing. Both state 10W-30 is the recommended viscosity, and is preferred for all temps above 0F.

2000 TJ SE
2005 LJ Rubicon
mukluk is offline  
post #9 of 20 Old 09-21-2017, 09:39 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 69,063
Quote:
Originally Posted by mukluk View Post
... but the 2005 owner's manual shows 5W-30 acceptable only for temps below freezing.
You're misinterpreting the chart.

When you have a choice, buy American made.
Jerry Bransford is offline  
post #10 of 20 Old 09-21-2017, 09:59 PM
mukluk
Registered User
2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde
Posts: 2,582
Seems pretty straightforward to me, 10W-30 is preferred, 5W-30 isn't recommended unless the temps expected before the next oil change are below freezing. I realise both oils get no thinner than a 30wt when hot, but where they differ is the viscosity when cold. Based on the manufacturer's recommendation chart stating 10W-30 is preferred over 5W-30 for anything over 0F, I get the impression that in that temperature range 5W-30 is considered too thin... a hunch tells me the somewhat loose tolerances in our dated engine designs neccessitate the more viscous film of the thicker oil.
Attached Images
 

2000 TJ SE
2005 LJ Rubicon
mukluk is offline  
post #11 of 20 Old 09-21-2017, 10:14 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 69,063
It's clear you don't understand how viscosities work then. Both have the exact same 30 weight viscosity once warmed up.
arg0413 likes this.

When you have a choice, buy American made.
Jerry Bransford is offline  
post #12 of 20 Old 09-22-2017, 12:01 AM
mukluk
Registered User
2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde
Posts: 2,582
Reread the second sentence from my last reply.

I do understand viscosities. I understand both oils are the same when warmed up. I understand the 5wt is thinner than the 10wt when cold. What I'm saying is the thicker 10wt when cold may be needed to sustain proper lubrication inside the engine prior to a cold engine start due to the tolerances in our engines, ie, the 10W-30 is more likely to stay put where it's needed than the 5W-30 in warmer temps. Make sense? Something you may want to consider is what would be the reason the factory changed the temperature range for 5W-30 in their chart, and why did they always insist 10W-30 was the preferred weight?

In the long run people are more than welcome to use whatever oil they wish in their Jeep. Me personally, I'll stick with 10W-30 which is the preferred oil and has served me rather well.

2000 TJ SE
2005 LJ Rubicon
mukluk is offline  
post #13 of 20 Old 09-22-2017, 12:36 AM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 69,063
You keep missing a basic fact.. 5W-30 will never be a 5 viscosity in warmer temps. We'll just have to agree to disagree.
zipman35 likes this.

When you have a choice, buy American made.
Jerry Bransford is offline  
post #14 of 20 Old 09-22-2017, 01:30 AM
mukluk
Registered User
2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde
Posts: 2,582
5W-30 doesn't match the viscosity of 10W-30 until it reaches 212F... not really sure why it seems so far fetched that an engine would need a minimum viscosity when cold to ensure proper lubrication, even if that "cold" temperature is an ambient of well above freezing.

Maybe I'll understand some day, in the mean time I appreciate the discussion.

2000 TJ SE
2005 LJ Rubicon
mukluk is offline  
post #15 of 20 Old 09-22-2017, 07:08 AM
Ironhead
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2011
Location: Westchester
Posts: 4,557
I think this is a better way to look at it.



i'd like to see the viscosity curve between 5w-30 and 10w-30 at different engine temps as neither are 30 until 212 deg. im guessing its minimal and warm up times are under 5 min for me, even when its 20 below
Jerry Bransford likes this.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Ironhead is online now  
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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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



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