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  #1  
Old August 17th, 2009, 12:31
muddeprived muddeprived is offline
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what's the thickest oil weight to run?

I got a rear main seal leak. It gets kinda bad when i'm cruising on the freeway at 65 mph and whenever the jeep is warmed up. I have a trail ride coming up this weekend and don't have time to fix the seal so I'm thinking of running thicker oil just until I can fix it next week or so. What's the thickest engine oil I can run in the jeep to maybe reduce the leak? Is there any quality additives I can toss in there to reduce it?

I run 5w-30 year round.
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  #2  
Old August 17th, 2009, 12:42
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Re: what's the thickest oil weight to run?

I've read that some guys run 15w40.
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Old August 17th, 2009, 12:45
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Re: what's the thickest oil weight to run?

Put in about a cup of lacquer thinner in the oil. It will soften and swell the seals. There are off the shelf additives available as well, but they use the same stuff/concept.
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Old August 17th, 2009, 12:47
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Re: what's the thickest oil weight to run?

Quote:
Originally Posted by old_man View Post
Put in about a cup of lacquer thinner in the oil. It will soften and swell the seals. There are off the shelf additives available as well, but they use the same stuff/concept.
what are some other shelf additives?
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  #5  
Old August 17th, 2009, 12:48
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Re: what's the thickest oil weight to run?

The first # is the cold viscosity (thickness at startup)
The second # is the hot viscosity (running temp thickness)

15w40 is not much thicker than 5w30 when warmed up
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  #6  
Old August 17th, 2009, 12:49
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Re: what's the thickest oil weight to run?

Hey Mudd I run Rotella 15-40 in both my rigs. It is a diesel oil but it is better for my engine.

You will have no problem running 15w40.
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Old August 17th, 2009, 13:02
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Re: what's the thickest oil weight to run?

I have used 1qt of 20w50 as a thickener works fine. If you want more than that put half a quart of Lucas stabilizer in there.
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Old August 17th, 2009, 13:03
muddeprived muddeprived is offline
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Re: what's the thickest oil weight to run?

Thanks guys. What about 20w-50? I saw this available with all the other oil weights. That should be thicker.
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Old August 17th, 2009, 13:20
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Re: what's the thickest oil weight to run?

When I worked parts I saw a couple guys try to fix a leak in their ford van with 80-140 gear oil. They dumped 6 quarts in and actually made it to the end of the parking lot before the truck quit for good.


15-40 diesel like Rotella is a good choice, and about as thick as I would go. At one point you will start to tax your pump's abilities to push it through the passageways, and the oils ability to lubricate the bearings in the crank journals.
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Old August 17th, 2009, 13:40
muddeprived muddeprived is offline
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Re: what's the thickest oil weight to run?

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Originally Posted by wolfpackjeeper View Post
When I worked parts I saw a couple guys try to fix a leak in their ford van with 80-140 gear oil. They dumped 6 quarts in and actually made it to the end of the parking lot before the truck quit for good.


15-40 diesel like Rotella is a good choice, and about as thick as I would go. At one point you will start to tax your pump's abilities to push it through the passageways, and the oils ability to lubricate the bearings in the crank journals.
The thick oil won't be in there long enough to do any harm. It'll be out next week or so when I do the rear main.

Do you think Lucas oil stabilizer will help? I've been recommended this by a couple of people here and at the shop. They said it works well in reducing leaks.
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Old August 17th, 2009, 13:44
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Re: what's the thickest oil weight to run?

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Originally Posted by muddeprived View Post
Thanks guys. What about 20w-50? I saw this available with all the other oil weights. That should be thicker.
I used it in my old rig with 220k on the clock. Still ran great without any more excess leaks or smoke at 240k.

During the winter id use 10w-30 though, but if you live in an always warm climate I wouldnt worry about it.
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Old August 17th, 2009, 13:50
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Re: what's the thickest oil weight to run?

5w50 would be awesome
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  #13  
Old August 17th, 2009, 15:21
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Re: what's the thickest oil weight to run?

I like the lucas oil stabilizer. Some people blast it, and try to cite some testing sites, but from what i have seen most of the sites blasting it are running biased or false tests, and are funded by a major competitor.
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  #14  
Old August 17th, 2009, 18:37
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Re: what's the thickest oil weight to run?

I currently run 20w-50, she purrs like a kitten.
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  #15  
Old August 17th, 2009, 18:55
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Re: what's the thickest oil weight to run?

Quote:
Originally Posted by wolfpackjeeper View Post
When I worked parts I saw a couple guys try to fix a leak in their ford van with 80-140 gear oil. They dumped 6 quarts in and actually made it to the end of the parking lot before the truck quit for good.
It motor oil terms thats more like a 40W-60 motor oil. Hot would have probably been okay, but they probably pretzeled the oil pump shaft trying to pump that cold.
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