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#4705759 - 03/24/18 08:10 PM Chrysler changing oil spec Grand Cherokee 4.7 H.O.
Turbo Offline

Registered: 01/02/07
Posts: 19
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.

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

Edited by Turbo (03/24/18 08:15 PM)

#4705798 - 03/24/18 08:33 PM Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo]
Snagglefoot Offline

Registered: 12/31/17
Posts: 1305
Loc: Alberta
Very anomalous change for the 2002-04 4.7 H.O. Was it experiencing lifter noise?

The 6.1 using 0w-40 I understand. Itís 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.

Edited by Snagglefoot (03/24/18 08:38 PM)

#4705834 - 03/24/18 09:03 PM Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo]
earlyre Offline

Registered: 11/22/11
Posts: 3809
Loc: 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.
09 Mercury Sable : 6qts AutoQuest(Meijer/Warren) 0w20, WIX 51516
Mine to Maintain:
03 Pontiac Vibe : 4.5qts VWB 5w30,WIX 51394

#4706108 - 03/25/18 08:29 AM Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo]
LotI Offline

Registered: 01/01/13
Posts: 1228
Loc: 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 Mazda6 GT

#4706260 - 03/25/18 10:55 AM Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo]
JLTD Online   content

Registered: 12/15/17
Posts: 391
Loc: US
The TSB said error in printing which is certainly possible. Maybe also the long timing chains were shearing thee oil too rapidly?
2015 4Runner SR5 1GR-FE

#4707239 - 03/26/18 08:25 AM Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo]
KCJeep Offline

Registered: 06/30/11
Posts: 6971
Loc: 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.
04 Jeep Grand Cherokee 4.0 147k - GTX 5w30/10w40
09 Lincoln MKZ AWD 90k - M1 AFE 0w30
12 KIA Sedona 85k - Edge 0w40
09 Ford Focus 127k - GTX UltraClean 5w30
00 Chevy Lumina 192k - Supertech FS HM 5w30

#4708690 - 03/27/18 05:24 PM Re: Chrysler changing oil spec Grand Cherokee 4.7 H.O. [Re: Turbo]
Garak Offline

Registered: 12/05/09
Posts: 24064
Loc: 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, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515