94 Northstar Oil Leak

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Northstar Engines and System Technical Discussion Discussion, 94 Northstar Oil Leak in Cadillac Engine Discussion; I have a 94 Seville with 76k miles and it has a oil leak. My shop told me it seems ...
  1. #1
    Major League is offline Cadillac Owners Member
    Join Date
    Mar 2004
    Alpharetta, Ga

    Angry94 Northstar Oil Leak

    I have a 94 Seville with 76k miles and it has a oil leak. My shop told me it seems to be coming from the front & rear main seals. From reading posr here it seems this is a common problem. Is there any type of oil additive that might help stop/slow down this leak?

    Bob L

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  3. #2
    zonie77 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 ETC,97 STS
    Join Date
    Sep 2003

    Re: 94 Northstar Oil Leak

    I've had mixed luck with additives. They do softern seals but they won't fix tears or leaks from worn seals or shafts. For the cost of a bottle it might be worth a try.

  4. #3
    Olds3.5 is offline Cadillac Owners Member
    Join Date
    Mar 2004

    Re: 94 Northstar Oil Leak

    Though I am not very familiar with the 94 N*, I have found that oil stop leaks generally have little to no effect on leaks associated with major engine seals and gaskets. For years, my company would add oil stop leak products to their old vehicles in our fleet just to harvest all of the life out of them. The best case scenario is that a stop leak will buy you time, not a cure. I doubt any of the products worked. I have seen additives extend the life of steering racks by swelling the old, shrunken o-rings but that's about it.

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