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Chrysler changing oil spec Grand Cherokee 4.7 H.O. #4705759
03/24/18 08:10 PM
03/24/18 08:10 PM
Joined: Jan 2007
Posts: 20
USA NY
Turbo Offline OP
Turbo  Offline OP

Joined: Jan 2007
Posts: 20
USA NY
Need to change the oil in a 2004 Grand Cherokee with the 4.7 High Output Engine. Found some very interesting information and was wondering why would Chrysler change oil specs after a vehicle has been in service for six years? The factory service manual says 5w-30 is preferred up to 100F and it is even labeled on the oil fill cap. In 2008 six years after this motor was first introduced they release a Technical Service Bulletin changing the oil spec to 5w-30 for below 32F and 10w-30 for above 0f. Why would they do this? Don't you think it is a little late in the game for such a change? Does anyone here know why this was done. The bulletin is basically saying we made a mistake. Why not run the 5w-30 in the warmer weather especially if it is synthetic.

Here is the factory owners manual. Page 260 has the oil recommendations.
https://cdn.dealereprocess.net/cdn/servicemanuals/jeep/2004-grandcherokee.pdf



BULLETIN NUMBER: 04172008
TO: All Lubrication Guides Users
FROM: Specifications Team, Chek-Chart Data Acquisition
DATE: April 17, 2008

SUBJECT: Engine oil viscosity listed for 2001-08 Jeep Grand Cherokee and 2007-08 Jeep Commander

Please be advised that the engine oil viscosity as published in our Lubrication Guides is incorrectly listed in some occasions for the 2001-08 Jeep Grand Cherokee and 2007-08 Jeep Commander. The OEM recommended engine oil viscosity for the 2001-08 Jeep Grand Cherokee and 2007-08 Jeep Commander is listed below:

2007-08 3.0L Turbo Diesel All Temperatures - SAE 5W-30

2005-06 3.7L All Temperatures - SAE 5W-30

2007-08 3.7L All Temperatures - SAE 5W-20

2001-04 4.0L Above 0 degrees Fahrenheit - SAE 10W-30
Below 32 degrees Fahrenheit - SAE 5W-30

2001-04 4.7L Above 0 degrees Fahrenheit - SAE 10W-30
Below 100 degrees Fahrenheit - SAE 5W-30

2005-06 4.7L All Temperatures - SAE 5W-30

2007-08 4.7L All Temperatures - SAE 5W-20

2002-04 4.7L High Output Above 0 degrees Fahrenheit - SAE 10W-30
Below 32 degrees Fahrenheit - SAE 5W-30

2005-08 5.7L All Temperatures - SAE 5W-20

2006-08 6.1L All Temperatures - SAE 0W-40

Last edited by Turbo; 03/24/18 08:15 PM.
Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo] #4705798
03/24/18 08:33 PM
03/24/18 08:33 PM
Joined: Dec 2017
Posts: 3,911
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 3,911
SE British Columbia, Canada
Very anomalous change for the 2002-04 4.7 H.O. Was it experiencing lifter noise?

The 6.1 using 0w-40 I understand. Its a dedicated high performance motor and most likely will be driven hard.

Small typo for the 4.7. Should probably read below 32, not below 100.

Last edited by Snagglefoot; 03/24/18 08:38 PM.

If you want the job done right......do it yourself.
Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo] #4705834
03/24/18 09:03 PM
03/24/18 09:03 PM
Joined: Nov 2011
Posts: 4,121
Lima, Ohio, USA
earlyre Offline
earlyre  Offline

Joined: Nov 2011
Posts: 4,121
Lima, Ohio, USA
if you want to muddy the waters further, My brother's '07 Dakota has the 4.7 HO, it's manual calls for a blanket 5w20 across all temps and engine configurations.


Mine:
13 Ford C-MAX hybrid: MC 5w20, & FL910s (in theory)
Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo] #4706108
03/25/18 08:29 AM
03/25/18 08:29 AM
Joined: Jan 2013
Posts: 1,503
America's Dairyland
LotI Offline
LotI  Offline

Joined: Jan 2013
Posts: 1,503
America's Dairyland
Ford has done this too with the 6.8l V10 gasser. Up to 2015, they spec'd 5w-20 like all the other modular motors but then made a change to 5w-30.

There were no changes to the engine with the switch to 30 grade oil and it's not retroactive. Since it's a HD vehicle they don't have to go through emission testing again.

I run a A3/B4 in mine.


03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450
17 VW GTI
[IMG]http://badges.fuelly.com/images/sig-us/803455.png[/IMG]
Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo] #4706260
03/25/18 10:55 AM
03/25/18 10:55 AM
Joined: Dec 2017
Posts: 1,719
US
JLTD Offline
JLTD  Offline

Joined: Dec 2017
Posts: 1,719
US
The TSB said error in printing which is certainly possible. Maybe also the long timing chains were shearing thee oil too rapidly?


I use the overseas owner's manual to choose my oil.

Using AMSOIL

Hers: 2008 Jeep Liberty 138k, SS 5w30/Amsoil

His: 2015 4Runner 45k, OE 5w30/Wix

Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo] #4707239
03/26/18 08:25 AM
03/26/18 08:25 AM
Joined: Jun 2011
Posts: 7,244
Mahzurrah!
KCJeep Offline
KCJeep  Offline

Joined: Jun 2011
Posts: 7,244
Mahzurrah!
They are trying to avoid too thin of oil due to shear. The 5w30's of the era were not as good as now, and even today you could reasonably expect less shear with a 10w30 over a 5w30.

The old 4.0 which I still own does not do well on thinner oils, and had the 10w30 recommendation right from the start.

I have run everything from 5w30 to SAE 30 and HDEO 10w30's in mine depending on temperature. I can assure you at temps above 20 degrees or so you will not likely notice the slightest running difference between a 10w30 and a 5w30.

In my Jeep, as long as it's above 45 or so, the SAE 30 starts and runs just like a 10w30.


2018 VW Passat GT VR6 - 6k - Valvoline MST 5w40 - VW OEM filter
2012 KIA Sedona 96k - PP HM 10w30
2009 Ford Focus 135k - Supertech FS HM 5w30
2004 Jeep Grand Cherokee, gone but not forgotten.
Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo] #4708690
03/27/18 05:24 PM
03/27/18 05:24 PM
Joined: Dec 2009
Posts: 26,842
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline

Joined: Dec 2009
Posts: 26,842
Regina, Saskatchewan, Canada
Chrysler likes to complicate oil choices, I think. wink


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
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