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Unread 11-06-2007, 04:43 PM   #1
mmerlina
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OIl type in my CJ7

Hey everyone, I have an 86 CJ7, I just want to know the thickest oil you think I can put in there and still be safe. I live in Boston so the weather normally ranges between 20-95 degrees.

Thanks!

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1986 Jeep CJ7 (photos)
Remanufactured 258, ARB lockers front & rear, 4.10 Yukon gears, 35x12.5" Super Swamper SSR's, Motorcraft 2100, 4.5" Rubicon Express Extreme-Duty lift, York 210 OBA, Big Daddy steering, Tatton rear CV driveshaft, Herculined interior, TJ flares, lots of body & upholstery work
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Unread 11-06-2007, 04:54 PM   #2
SuB8HaVeN
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I would just run some good old 10W-30.
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Unread 11-06-2007, 05:44 PM   #3
mmerlina
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Well reason I ask about the thickest is because I have a very very very minor leak out of my new valve cover and I don't know which oil is in there now, but it looks very thin.

I wanted to go a little thicker to see if it would stop the leak.
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1986 Jeep CJ7 (photos)
Remanufactured 258, ARB lockers front & rear, 4.10 Yukon gears, 35x12.5" Super Swamper SSR's, Motorcraft 2100, 4.5" Rubicon Express Extreme-Duty lift, York 210 OBA, Big Daddy steering, Tatton rear CV driveshaft, Herculined interior, TJ flares, lots of body & upholstery work
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Unread 11-06-2007, 05:49 PM   #4
SuB8HaVeN
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Running thicker oil doesn't necessarily stop leaks. If the leak is very, very minor I wouldn't worry about it. I have an aluminum valve cover on mine as well and it works great, but still leaks a very little bit; not enough to really notice it or make any difference in oil levels. If the oil seems thin I would just go ahead and replace it. I would say it's OK to run 15W-40 (that's what I run in mine), but never having lived in a cold climate (it's 60 down here in Florida and I'm freezing my a** off), I wouldn't know how the cold weather affects the oil.
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1961 Willys 4x4 Wagon L-226 I6 T90 (restoration also in progress)
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Unread 11-06-2007, 05:52 PM   #5
mmerlina
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Well running thicker oil is the only solution I have left. I tried about 10 times to seat that valve cover so it doesn't leak, but I just gave up. This is the smallest it's been so I decided to just leave it alone.

I don't really much care about that it is leaking, what sucks is that it's leaking on the exhaust manifold side, so driving down the highway all I smell the entire time is a thick smog of burning oil inside the cabin.

The PO was the last one to do the oil so maybe he used some watered down crap for all I know. I'm going to see if I can find something a little better.
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1986 Jeep CJ7 (photos)
Remanufactured 258, ARB lockers front & rear, 4.10 Yukon gears, 35x12.5" Super Swamper SSR's, Motorcraft 2100, 4.5" Rubicon Express Extreme-Duty lift, York 210 OBA, Big Daddy steering, Tatton rear CV driveshaft, Herculined interior, TJ flares, lots of body & upholstery work
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Unread 11-06-2007, 06:02 PM   #6
kappa505
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I use straigt 30w and I am in michigan. Its cold today.
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Unread 11-06-2007, 06:54 PM   #7
JeepHammer
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15w40 in the spring, summer, and fall,

10w30 in the winter unless you do a lot of high speed driving, then use a 10w40 in the winter.
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Unread 11-06-2007, 06:58 PM   #8
mmerlina
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I'm not exactly clear which is the thicker oil? Which is thicker, 5w30 or 10w30?
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1986 Jeep CJ7 (photos)
Remanufactured 258, ARB lockers front & rear, 4.10 Yukon gears, 35x12.5" Super Swamper SSR's, Motorcraft 2100, 4.5" Rubicon Express Extreme-Duty lift, York 210 OBA, Big Daddy steering, Tatton rear CV driveshaft, Herculined interior, TJ flares, lots of body & upholstery work
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Unread 11-06-2007, 07:52 PM   #9
kappa505
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They are both multi viscosity oils. 5w has less viscosity than 10w when the oil is hot or any other temp for that matter.

According to haynes:
Multiviscosity Oil
Above 40 degrees F SAE 10W-30,40,50 or 20W-40,50
32 degrees F SAE 10W-30 or 10W-40
0 degrees F Same as above
Below 0 degrees F SAE 5W-20 or 5W-30
Single viscosity Oil
Above 40 SAE 30 or 40
32 SAE 20W-20
0 SAE 20
Below 0 SAE 10W

So as you can see, you can use pretty much anything.
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Unread 11-07-2007, 06:55 PM   #10
James04TJ
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Quote:
Originally Posted by kappa505
They are both multi viscosity oils. 5w has less viscosity than 10w when the oil is hot or any other temp for that matter.
Not exactly. The temperature at operating viscosity will be within the same range at operating temperature regardless of being a 5w, 10w, 15w, etc...

For example, I offer the following four group III oils:
AMSOIL XLM 5w-20
Kinematic Viscosity @ 100C, cSt (ASTM D-445) 8.5
Kinematic Viscosity @ 40C, cSt (ASTM D-445) 45.4

AMSOIL XLF 5w-30
Kinematic Viscosity @ 100C, cSt (ASTM D-445) 10.5
Kinematic Viscosity @ 40C, cSt (ASTM D-445) 58.2

AMSOIL XLT 10w-30
Kinematic Viscosity @ 100C, cSt (ASTM D-445) 10.5
Kinematic Viscosity @ 40C, cSt (ASTM D-445) 63.6

AMSOIL XLO 10w-40
Kinematic Viscosity @ 100C, cSt (ASTM D-445) 15.7
Kinematic Viscosity @ 40C, cSt (ASTM D-445) 104.4

As you can see the difference when cold (40C) between a 5w-30 and 10w-30 can be seen. The voscosity at operating temperature (100C) is the same.
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Unread 11-07-2007, 07:54 PM   #11
kappa505
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I can also split hairs.........but thanks for setting me smart.
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"Nothing in the world can take the place of Persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan 'Press On' has solved and always will solve the problems of the human race." Supposedly President Coolidge
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