Rear main seal

Jackjack97

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Sacramento CA

• Nov 28, 2020

• #1

About a year ago I replaced the rear main seal and oil pan gasket when I did a clutch on my 97 tj. It looks like it is leaking again . Behind the valve gasket is dirty black but not wet from oil. Can anyone confirm the rear main is leaking?

 

TJ2

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• Nov 28, 2020

• #2

I have the same thing in my manual trans. I suspect it's an RMS leak.
I will switch to Dino and observe a bit in few weeks.

 

Last edited: Nov 28, 2020

T

T Crawford

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PNW

• Nov 28, 2020

• #3

I’d clean it off and check I. A few eeeks not enough to worry about

 

TJ Starting

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• Nov 28, 2020

• #4

I'm a young guy, what's this dino oil people keep talking about? I've never seen such.

 

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jazngab

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• Nov 28, 2020

• #5

TJ Starting said:

I'm a young guy, what's this dino oil people keep talking about? I've never seen such.

Click to expand...

Conventional oil

 

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Tomcat

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• Nov 28, 2020

• #6

TJ Starting said:

I'm a young guy, what's this dino oil people keep talking about? I've never seen such.

Click to expand...

Try this, has a seal conditioner.

 

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Fonz54

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• Nov 28, 2020

• #7

Isn’t Mobile Super High Mileage a synthetic blend?

 

Jackjack97

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• Nov 28, 2020

• #8

Tomcat said:

Try this, has a seal conditioner.

View attachment 206451

Click to expand...

I did an oil change with high mileage oil today I don’t really believe in the high mileage stuff but we will give it a shot

 

PaulCC

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Arkansas, United States

• Nov 29, 2020

• #9

Tomcat said:

Try this, has a seal conditioner.

View attachment 206451

Click to expand...

Good stuff. Using it in my 04 4.0 Grand Cherokee and 98 5.2 Dakota.

 

Jerry Bransford

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• Nov 29, 2020

• #10

Jackjack97 said:

I did an oil change with high mileage oil today I don’t really believe in the high mileage stuff but we will give it a shot

Click to expand...

Mobil Super 10W-30, a conventional high-mileage oil, completely cured a bad RMS leak I had in my previous car in 3-4 days.

 

Jackjack97

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• Dec 16, 2020

• #11

Jerry Bransford said:

Mobil Super 10W-30, a conventional high-mileage oil, completely cured a bad RMS leak I had in my previous car in 3-4 days.

Click to expand...

So did you use this oil for 3k miles or did you change it after a little while

 

Jerry Bransford

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• Dec 16, 2020

• #12

Jackjack97 said:

So did you use this oil for 3k miles or did you change it after a little while

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My change intervals are 5k miles. The 3k change interval was dreamed up by Jiffylube to increase sales.

 

Jackjack97

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• Dec 16, 2020

• #13

Jerry Bransford said:

My change intervals are 5k miles. The 3k change interval was dreamed up by Jiffylube to increase sales.

Click to expand...

Okay so did you change just change out the mobile one at your normal oil change time

 

Jerry Bransford

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• Dec 16, 2020

• #14

Jackjack97 said:

Okay so did you change just change out the mobile one at your normal oil change time

Click to expand...

I stayed with the Mobil Super. I have never used Mobil 1.

 

Fishtaco

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• Dec 17, 2020

• #15

BlueDevil Rear Main Sealer seems to cure it for most that I have read but remember I know nothing about jeeps yet I bought some before I even bought my first TJ lol

 

Fonz54

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• Dec 17, 2020

• #16

Jerry Bransford said:

I stayed with the Mobil Super. I have never used Mobil 1.

Click to expand...

Hi Jerry
I ordered Mobil Super 10-30 from Amazon. It says it is a synthetic blend. Is this what you used? I searched Mobil’s website but cannot find just plain old Dino Mobil Super.

 

Fonz54

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• Dec 17, 2020

• #17

Tomcat said:

Try this, has a seal conditioner.

View attachment 206451

Click to expand...

Where can one purchase this Unicorn? I found 10W-40 at Summit. Napa used to have the conventional but not anymore. Mobil's website only shows the Synthetic Blend High Mileage. Used Penz Oil High Mileage conventional for my last change definitely slowed the RMS leak but she's still drippin' - that's why I call her Leakin' Lena!

 

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LONGJP2

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• Dec 17, 2020

• #18

I've ran into the same problem, just last week. Both Amazon and Walmart advertised Mobil Super Conventional, yet both delivered Synthetic Blend.

Ordered this, but got Synthetic Blend instead.
https://www.walmart.com/ip/3-Pack-M...MIgMDtyJjW7QIVRrGGCh3VvA4MEAYYASABEgIojvD_BwE

 

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LONGJP2

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• Dec 17, 2020

• #19

Fonz54 said:

Isn’t Mobile Super High Mileage a synthetic blend?

Click to expand...

It says it is.

 

Fonz54

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• Dec 17, 2020

• #20

LONGJP2 said:

It says it is.

Click to expand...

Right but I did find non-synthetic Mobil 10W-40 on Summit racing. The 10W-30 on Summit is synthetic-blend.