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
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
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