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Old December 12th, 2013, 09:46 AM   #1
wave_crusher
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Default Does liquid rear main sealer actually work?

While attempting to find out why my 4x4 doesn't work; I noticed that there was oil leaking from the bottom of my bell housing; which really could only be a rear main to me. I don't have a place that I could work on it; unless attempting to replace a rear main seal in the parking lot of a snow covered apartment catches my fancy lol

So, is there any of the rear main sealer in a bottle that actually works? I don't expect it to turn my bad seal into a brand new one; I just need something to last a couple weeks until I go home and have a dry place to work

Thanks
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Old December 12th, 2013, 09:52 AM   #2
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High milage oil seemed to slow down a couple leaks i had. But the leak returned with normal oil.
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Old December 12th, 2013, 09:58 AM   #3
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I had a leak using synthetic pennzoil. Now I run Rotella T conventional 15w-40 and no problems.

Don't know if the liquid rear main seal stuff works though.
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Old December 12th, 2013, 10:04 AM   #4
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Quote:
Originally Posted by wave_crusher View Post
While attempting to find out why my 4x4 doesn't work; I noticed that there was oil leaking from the bottom of my bell housing; which really could only be a rear main to me. I don't have a place that I could work on it; unless attempting to replace a rear main seal in the parking lot of a snow covered apartment catches my fancy lol

So, is there any of the rear main sealer in a bottle that actually works? I don't expect it to turn my bad seal into a brand new one; I just need something to last a couple weeks until I go home and have a dry place to work

Thanks
Is it a slow leak or leaves puddles? Cause if it's a slow leak it will buy you time...
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Old December 12th, 2013, 10:31 AM   #5
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Originally Posted by 8PTBUCK View Post
I had a leak using synthetic pennzoil. Now I run Rotella T conventional 15w-40 and no problems.

Don't know if the liquid rear main seal stuff works though.
I use Valvoline synthetic; a friend uses rotella 15w-40 too. Would there be any issues by changing to a thicker oil? I use 10W-30 now.

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Is it a slow leak or leaves puddles? Cause if it's a slow leak it will buy you time...
slow leak; doesn't leave puddles at least that i've noticed. Checked the oil level and it's still good.
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Old December 12th, 2013, 10:34 AM   #6
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No issue. I used to run 5w-30 conventional Pennzoil. Then switched to the synthetic. Now back to conventional, but 15w-40. Didn't notice any problem. Rotella is great oil and readily available... for cheap!
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Old December 12th, 2013, 10:49 AM   #7
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Find a local parts store... Mom and Pap type of place... See if they carry HAPCO products... Get the PRO SEAL... Shit works awesome...
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Old December 12th, 2013, 11:12 AM   #8
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Find a local parts store... Mom and Pap type of place... See if they carry HAPCO products... Get the PRO SEAL... Shit works awesome...
Yup. Worked for me work one application and lasted for years. Still wasn't leaking when I sold the car.
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Old December 13th, 2013, 09:43 PM   #9
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What type of vehicle? Most rear mains nowadays are one piece, so your gonna have to pull the trans back or out, I would Deff try the pro seal... If its not pissing right out its not worth replacing, also from what I've noticed synthetic oils tend to leak more compared to conventional oil, rotella would Deff help also
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Old December 15th, 2013, 10:02 PM   #10
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What type of vehicle? Most rear mains nowadays are one piece, so your gonna have to pull the trans back or out, I would Deff try the pro seal... If its not pissing right out its not worth replacing, also from what I've noticed synthetic oils tend to leak more compared to conventional oil, rotella would Deff help also
Didn't see this till now....it is a 96 5.7L vortec; I believe it is a one piece rear main. Not 100% right now.

It isn't pissing out; I did an oil change a couple weeks ago but the oil isn't low or anything yet. It is not leaking a lot but it is leaking.

I will try the pro seal; and I believe I am going to switch to rotella 15w-40; I've read a lot of good things about using it and I know a few people that run it on 200k+ engines and have always run it.
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