Rear main oil seal leak

Tiny
BBFRWAX
  • MEMBER
  • 1996 JEEP CHEROKEE
  • 4 CYL
  • 4WD
  • MANUAL
  • 174,000 MILES
Because of the mileage on my 96 XJ, like a dummy I started putting full synthetic oil in it. I've heard that doing that would cause the seals to leak.(AFTER THE FACT). Now, What would it do to my engine to drain out all the synthetic oil, and went back to a good oil like Castrol High Mileage along with some barsleak to try and stop the rear main oil seal leak
Saturday, December 25th, 2010 AT 3:13 AM

5 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
When seals leaks, there is no way of stopping the leak without replacing the seal.

Oil seals wears and hardens over time an no matter what oil you use, they would start leaking wdue to fatigue and wear.

Drain and refill the oil with a filter change is all you need to do.
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Saturday, December 25th, 2010 AT 3:19 AM
Tiny
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Does this mean I can go back to conventional oil after running full synthetic without hurting the engine?
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Saturday, December 25th, 2010 AT 11:48 AM
Tiny
KHLOW2008
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Yes, there is no problem with that.

The most important thing about usage of oil is that they are within specifications as recommended and follow the oil change interval regularly.
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Saturday, December 25th, 2010 AT 12:01 PM
Tiny
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TO KHLow2008,
Thanks for your help, Now it wont cost me as much to change my oil, I'll just check more often until I get the leak fixed.
Thanks again, Happy Holidays !

Bobby Belk
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Saturday, December 25th, 2010 AT 12:42 PM
Tiny
KHLOW2008
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You're welcome.

Merry Christmas and A Happy New Year.
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Saturday, December 25th, 2010 AT 5:11 PM

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