College DD
Thread Starter
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
I use 5W-30 full synthetic year round.
CF Veteran
Joined: Jun 2011
Posts: 1,023
Likes: 1
From: Southern Idaho
Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
Thread Starter
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
CF Veteran
Joined: Jun 2011
Posts: 1,023
Likes: 1
From: Southern Idaho
Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
Oil is oil, but it's a fact that full synth does better... Usually, I run a viscosity one step lighter than suggested for a given temp range. Doesn't hurt the engine and you'll get more efficiency (less resistance within engine).
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Thanks I know what that is. Why are you running 5w20 in a 4.0? They are specced for w30 and w40 grades, wearing the least on stuff like 0W40 and 5W40. Do you only drive 1 mile at a time or something?
CF Veteran
Joined: Jun 2011
Posts: 1,023
Likes: 1
From: Southern Idaho
Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
http://www.bobistheoilguy.com/motor-oil-101/
Motor oil has come a long way. Lighter viscosity oil will do better for your engine. You have much to learn, young padawan
Thread Starter
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
Read:
http://www.bobistheoilguy.com/motor-oil-101/
Motor oil has come a long way. Lighter viscosity oil will do better for your engine. You have much to learn, young padawan
CF Veteran
Joined: Jun 2011
Posts: 1,023
Likes: 1
From: Southern Idaho
Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
Seasoned Member
Joined: Apr 2013
Posts: 429
Likes: 0
From: Purcellville, Virginia
Year: '95
Model: Cherokee
Engine: 4.0 HO
Thread Starter
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Sorry dude.
'98 for reliability eh? What's the maintenance history on the critical sensors like CKP, CMP, and other leave-you-stranded **** like fuel pump?
If you haven't already, make sure to clean all of your connectors and grounds, hit with the electric grease, and seal the edge with dielectric to keep water and other contaminants out.
'98 for reliability eh? What's the maintenance history on the critical sensors like CKP, CMP, and other leave-you-stranded **** like fuel pump?
If you haven't already, make sure to clean all of your connectors and grounds, hit with the electric grease, and seal the edge with dielectric to keep water and other contaminants out.
Thread Starter
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
Sorry dude.
'98 for reliability eh? What's the maintenance history on the critical sensors like CKP, CMP, and other leave-you-stranded **** like fuel pump?
If you haven't already, make sure to clean all of your connectors and grounds, hit with the electric grease, and seal the edge with dielectric to keep water and other contaminants out.
'98 for reliability eh? What's the maintenance history on the critical sensors like CKP, CMP, and other leave-you-stranded **** like fuel pump?
If you haven't already, make sure to clean all of your connectors and grounds, hit with the electric grease, and seal the edge with dielectric to keep water and other contaminants out.
Thanks.
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hubbazoot
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
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