Oil ?
09-01-2012, 11:56 AM
#2
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
Any weight that is listed in the owners manual and any brand that has the API starburst symbol. I do prefer a 5WXX or 0WXX 1st number weight as it flows quicker/better at start-up when the motor/oil temp is below operating temp.
09-01-2012, 12:13 PM
#4
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Not again.
Sorry but this has been beaten to death. Do a quick search and you WILL find a lot of info there that may give you what you want to know.
Sorry but this has been beaten to death. Do a quick search and you WILL find a lot of info there that may give you what you want to know.
09-01-2012, 12:28 PM
#5
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Year: 1996
Model: Cherokee
Engine: 4.0L
Right now im running mobil 1 10w30 and a k&n oil filter but next change im gonna run shell rottella 15w40 for the winter with a wix oil filter
09-01-2012, 01:13 PM
#7
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
All though, I am puzzled why one would go from a lighter oil now to a heavier oil when it gets cooler (in winter)?.......maybe tricked again?
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09-01-2012, 05:28 PM
#8
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Originally Posted by djb383
It's a trick question........and I fell for it.
All though, I am puzzled why one would go from a lighter oil now to a heavier oil when it gets cooler (in winter)?.......maybe tricked again?
09-01-2012, 06:54 PM
#10
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I use 15-40 Rotella and Wix or Napa filters.
Here's why:
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
Here's why:
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
09-01-2012, 09:16 PM
#11
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Year: 1998
Model: Cherokee
Engine: 4.0L
Personally I run 15W-40 Delo diesel oil and a K&N Wrench Off oversized filter. I've seen a 10lb jump in oil pressure alone and my Jeep seems much happier with the new oil. (Also helps that my last oil was drowning in the results of my seafoaming! But YMMV)
09-01-2012, 09:38 PM
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Year: 1998
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Unnecessary increased oil pressure just takes power from the end of the crank which in turn takes power from the wheels. The motor makes X amount of power.....so it takes more of X amount of power to pump a thicker fluid thus X amount of power is used to move a thicker fluid vs going to the wheels.
Last edited by djb383; 09-01-2012 at 09:43 PM.
09-02-2012, 08:13 AM
#15
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Unecessary increased oil pressure just takes power from the end of the crank which in turn takes power from the wheels. The motor makes X amount of power.....so it takes more of X amount of power to pump a thicker fluid thus X amount of power is used to move a thicker fluid vs going to the wheels.
And that's the catch phrase. I wouldn't think it's what you'd want in a motor with in spec bearing clearances. In my tired old 258's I'd move up to 20W50 and,although I can't prove it other than by how they sounded quieter mechanically,the increased oil pressure extended the life of them some.