Default Oil Grade for a 1973 CJ5 (3.8) 

Old 04-03-2015, 04:25 PM   #1
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So I have a 1973 CJ5 (3.8) and wanted to know the best oil grade to use for it.

 

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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 04-03-2015, 04:42 PM   #2
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For older engines I am a believer in the "Brad Penn" line of oils. As far as grade is concerned it really depends on your belief in what an oil is there for. The believers in light grade oils like to have their oil move quickly through the oil system. Fast moving oil also takes more heat along with it. The thick oil crowd, which I'm a part of, likes the idea of a relatively slow moving thick oil that holds up (stays oily) to heat making the best buffer against wear possible. Really it's up to you to decide, all oil does it's job well.

 

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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 04-03-2015, 04:44 PM   #3
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You would do fine with either 15W-40 or 20W-50(what I have used for 30 yrs in my Jeep).
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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 04-03-2015, 05:15 PM   #4
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I'm in the thin oil crowd. I run 5w-20 In my 73 with the 258 year round.

 

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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 04-03-2015, 06:15 PM   #5
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Quote:
Originally Posted by steve1973 View Post
I'm in the thin oil crowd. I run 5w-20 In my 73 with the 258 year round.
With the winters you see. Not a bad choice.
The OP is in Oceanside Ca. near San Diego.
Remember that those old AMC engines were built abit on the 'loose' side.
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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 04-03-2015, 08:51 PM   #6
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I run the thicker oils in summer and the thinner ones in winter.
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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 07-25-2015, 10:06 PM   #7
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I run Lucas "Magnum" 15w-40 DIESEL engine oil in my 258. Since my Daily Driver is a 1990 Dodge Cummins, I run the Lucas (or Rotella in a pinch) in both. Easier to just keep one type of oil around

 

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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 07-27-2015, 09:31 PM   #8
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Lucas oil additive is a joke-GOGGLE search will prove that.
I've been run'n STP(blue bottle)in my Jeep for over 30 years.
Have 120K miles on the un-rebuilt engine, and still shows 55psi hot oil pressure on the f'way.
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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 07-28-2015, 08:35 PM   #9
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Quote:
Originally Posted by Lumpy Grits View Post
Lucas oil additive is a joke-GOGGLE search will prove that.
Not sure who was speaking for lucas oil additive. I'm referring to their line of diesel engine oil. What makes you say that their additive is a joke? It does it's job rather well, which is primarily boils down to a thickener, more or less, like motor honey. Not looking to start a fight, just want to hear your input

EDIT:Not saying motor honey is a good product, but I fail to see how it or the Lucas additive could hurt anything

 

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Default Re: Oil Grade for a 1973 CJ5 (3.8) 

Old 07-28-2015, 10:15 PM   #10
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I'm a little interested too. Lucas oil products have always seemed right to me.

 

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