10w30?
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 12
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
You are wasting money and resources.
For conventional driving, using full synthetic and a quality filter, every 8000-10000 is OK.
Quit using the Lucas. Don't use a FRAM filter. Wix, NAPA Gold, or Mopar only.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Here are Jeeps recommendations from the late 80s:
Jeep Engine Oil Viscosity
This was taken from pages 82 and 83 of the 1989 Chrysler/Jeep owners manual.
Selecting Engine Oil Viscosity
When changing or adding engine oil select the proper grade by using the chart on the following page. Select the grade that corresponds to the ambient temperature range you expect to encounter before your next oil change.
30*F to 100*F+ 20W-40 or 20W-50
0*F to 100*F+ 10W-30 or 10W-40
-20*F to 60*F 5W-30
Jeep Engine Oil Viscosity
This was taken from pages 82 and 83 of the 1989 Chrysler/Jeep owners manual.
Selecting Engine Oil Viscosity
When changing or adding engine oil select the proper grade by using the chart on the following page. Select the grade that corresponds to the ambient temperature range you expect to encounter before your next oil change.
30*F to 100*F+ 20W-40 or 20W-50
0*F to 100*F+ 10W-30 or 10W-40
-20*F to 60*F 5W-30
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Way too often and fram sucks big time as does Lucas. I use Rotella and Wix every 5000 miles.
CF Veteran
Joined: Nov 2011
Posts: 2,322
Likes: 1
From: Edmonton
Year: 1990
Model: Cherokee
Engine: 4.0
I choose my viscosity by the ambient temperature. This is one situation where I agree with the recommendation of the Jeep engineers. Not everybody lives in the same climate. If I lived in Hawaii, I'd be using 10-30 all year long, but not in MN where I live! The -30 farenheit temperatures that we often experience mid-winter is damn cold, and I always use 5-30 for winter driving.
For temps primarily above 60 degrees farenheit, I use 10-30
For temps primarily below 60 degrees farenheit, I use 5-30
For temps primarily above 60 degrees farenheit, I use 10-30
For temps primarily below 60 degrees farenheit, I use 5-30
CF Veteran
Joined: Apr 2009
Posts: 4,734
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
CF Veteran
Joined: Apr 2012
Posts: 5,302
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From: Wisconsin
Model: Cherokee
Rotella was SM rated last time I looked. Might be SN by now, who knows. It's an excellent oil for gas motors.
Last edited by Radi; Jun 1, 2013 at 12:30 AM.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Oh god another oil thread. I'm surprised there isn't a sticky yet.
Run an oil within the appropriate range for your climate that makes the least amount of engine noise. In my climate 0w30, 5w30, 0w40, or 5w40 is desirable. You may find your 4.0 has less clatter on a High Mileage oil with more zinc (not API SN rated)
Use a reputable filter. FRAM used to be a decent brand but is now cheaper than cheap. Filters have a greater impact than getting crap out of the oil. They can make or break an engine with dry starts and flow restrictions. This really can't be understated.
You will find a lot of support for Shell Rotella 5w40 and WIX filters in Jeep 4.0s. Myself and many others run that combo (hankthetank runs 0W40 as it actually gets seriously cold up there)
Oil change interval is determined by engine health. If you want to know how long to keep it in, send some off for a used oil analysis. A good filter goes a long way, but there's no way in hell Amsoil and K&N will save you if your rings let an entire CC of fuel into the crank case on every compression stroke. A compression test would also be a good idea to get a rough picture of whether a long OCI is a good idea.
Do you have ANY idea what you're doing? Any idea at all?
You need to do some reading: http://www.bobistheoilguy.com/motor-oil-101/
"0w" has no impact on "lightness". He's running a heavy duty diesel oil - it's designed for tractor engines. And Shell Rotella T5/T6 multigrade 40 weights return some of the best used oil analyses for engine wear next to Mobil Delvac 1.
Run an oil within the appropriate range for your climate that makes the least amount of engine noise. In my climate 0w30, 5w30, 0w40, or 5w40 is desirable. You may find your 4.0 has less clatter on a High Mileage oil with more zinc (not API SN rated)
Use a reputable filter. FRAM used to be a decent brand but is now cheaper than cheap. Filters have a greater impact than getting crap out of the oil. They can make or break an engine with dry starts and flow restrictions. This really can't be understated.
You will find a lot of support for Shell Rotella 5w40 and WIX filters in Jeep 4.0s. Myself and many others run that combo (hankthetank runs 0W40 as it actually gets seriously cold up there)
Oil change interval is determined by engine health. If you want to know how long to keep it in, send some off for a used oil analysis. A good filter goes a long way, but there's no way in hell Amsoil and K&N will save you if your rings let an entire CC of fuel into the crank case on every compression stroke. A compression test would also be a good idea to get a rough picture of whether a long OCI is a good idea.
"0w" has no impact on "lightness". He's running a heavy duty diesel oil - it's designed for tractor engines. And Shell Rotella T5/T6 multigrade 40 weights return some of the best used oil analyses for engine wear next to Mobil Delvac 1.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
I know the look you are talking about. The same look I get from the Allison shop when I walk in with my 5 gallon jug asking for TranSynd (TH350 loves it)....and they don't see a truck out front.
Rotella was SM rated last time I looked. Might be SN by now, who knows. It's an excellent oil for gas motors.
CF Veteran
Joined: Apr 2012
Posts: 5,302
Likes: 23
From: Wisconsin
Model: Cherokee
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
