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Unread 09-15-2011, 11:08 AM   #1
gbilling
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1973 CJ5 
 
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Location: Gallatin, TN
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Best Oil Grade for 73 CJ5

Does anyone have a recommendation for the best oil grade for my 73 CJ5 258 inline 6?

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Unread 09-15-2011, 12:26 PM   #2
MrWonderful73
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1986 CJ7 
 
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I've been using Quaker State Enhanced durability (higher mileage engines) 10w30 and have been very happy with it. Took the valve cover off before last oil change and it looked nice and clean.
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Unread 09-15-2011, 01:45 PM   #3
FLynes
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10W30 is what I ran in the CJ, prior to teardown, and I had no problems whatsoever.

When my machinist rebuilt my 302 for my Mustang and my 402 for my Suburban, he told me to only run Castrol, Valvoline or Kendall GT-1 in my engines, or he would void my warranty. His opinion, which I trust, is that those are the best on the market. I was always a Pennzoil user (same company as Quaker State), and he told me that Pennzoil would gum an engine up over time.

To each his own on the brand, but I follow the Specifications Manual for my '76.

Fred
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High Plains Drifter
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Lime Green
Black Wellington Vinyl Bench Seats
258 I-6 1bbl
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Unread 09-15-2011, 04:11 PM   #4
86cj74.2L
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For the big 6 I would run the rotella T6 5w40 synthetic. I do
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Unread 09-15-2011, 04:51 PM   #5
lucdog
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Quote:
Originally Posted by 86cj74.2L View Post
For the big 6 I would run the rotella T6 5w40 synthetic. I do
No way would I run a 5w anything in any older jeep engine, my 1989 GMC with a 350, or my "02" 7.3 diesel.

I don't know about the new Chevys, but I have yet to hear a Ford or my Wifes 2011 grand Cherokee that didn't make lifter noise at startup, with 5w oil.

On edit, I know they don't have lifters. (OHC) but it sounds like lifter ticking to me

OP, my jeep engines all (4) have over 90,000 miles. I use 10w40 in the 4.0L (year round)
and 30w-30 in the 258's/304 until the temps drop into the 20's. 20w20 in the winter. 2 of the 4 don't get driven after October.

Bill
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 09-15-2011, 05:04 PM   #6
ninjakid
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Quote:
Originally Posted by lucdog

No way would I run a 5w anything in any older jeep engine, my 1989 GMC with a 350, or my "02" 7.3 diesel.

I don't know about the new Chevys, but I have yet to hear a Ford or my Wifes 2011 grand Cherokee that didn't make lifter noise at startup, with 5w oil.

OP, my jeep engines all (4) have over 90,000 miles. I use 10w40 in the 4.0L (year round)
and 30w-30 in the 258's/304 until the temps drop into the 20's. 20w20 in the winter. 2 of the 4 don't get driven after October.

Bill
My dads 09 ford f150 says in the manual to use synthetic 5w-20.
The only time my dad had someone else change the oil they put something other weight in it and he lost 3-5 mpg.
With that being said I wouldn't use 5w in my 258 either.
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Unread 09-15-2011, 05:05 PM   #7
ninjakid
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And now that I think about it his truck is a sohc so he wouldn't have lifters.
Need to think more before I post...
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Unread 09-15-2011, 05:16 PM   #8
lucdog
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Quote:
Originally Posted by ninjakid
And now that I think about it his truck is a sohc so he wouldn't have lifters.
Need to think more before I post...
My wives GC is OHC, and the Ford trucks like you wrote
Sure sounds like lifter ticking to me though

Bill
__________________
1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 09-15-2011, 06:28 PM   #9
86cj74.2L
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Uh, it's only 5w cold.

5w will pressurize the top end faster then a 10 weight and much faster then a strait 30 weight. Which will pressurize the lifters faster.

I have no problems using it in:

1998 Kawasaki zx9r
1970 chevelle ss396
1996 Saturn SL1
1986 cj7 4.2l
1994 ram with cummins
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Unread 09-15-2011, 06:51 PM   #10
lucdog
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Quote:
Originally Posted by 86cj74.2L
Uh, it's only 5w cold.

5w will pressurize the top end faster then a 10 weight and much faster then a strait 30 weight. Which will pressurize the lifters faster.

I have no problems using it in:

1998 Kawasaki zx9r
1970 chevelle ss396
1996 Saturn SL1
1986 cj7 4.2l
1994 ram with cummins
Your entitled to your opinion. I just don't agree with it.
__________________
1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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