98 Oil Leak Repair
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  • 2 Post By MoistCabbage
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 98 Oil Leak Repair in Past Cadillac Vehicle Discussion; Hi there, my mechanic Who I trust dearly says the only way to repair the oil leak that the northstar ...
  1. #1
    Mj2
    Mj2 is offline Cadillac Owners Member
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    98 Oil Leak Repair

    Hi there, my mechanic Who I trust dearly says the only way to repair the oil leak that the northstar is known for is to take the ENTIRE engine out and repair it frm the inside... Is this the only way...and is it really even necessary to git it fixed, the car gives me NO problems.. thanks

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  3. #2
    Slipgate is offline Cadillac Owners Enthusiast
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    Re: 98 Oil Leak Repair

    "necessary to git it fixed" depends on how much it leaks. If it covers you whole garage floor, it should probably be fixed. If it is a few drops leaking maybe a quart a month, just live with it and fill it when the DIC says the oil is low.

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Where's it leaking from?

    Oil pressure switch and oil filter adapter leaks are fairly common, and cheap and easy to fix.

    Cam cover leaks are a bit less common. And more difficult/expensive to repair. It's usually a small leak though.

    An oil pan or half case seal leak requires engine removal (or for the engine to be supported from above, and the cradle dropped out from under it). BIG jobs. Fortunately, those seals tend not to do much more than weep, or leak very slowly. And you can buy a LOT of oil for what it would cost to repair.

    ----------

    Quote Originally Posted by Slipgate
    just live with it and fill it when the DIC says the oil is low.
    WRONG!!!
    NEVER wait for a car to give you a warning light/message, instead of doing a simple fluid check every week, or every fill up.

    Use your DIPSTICK to check your oil level, maintain it at half way up the hash marks on the stick (xxxxxXxxxxx).

    .....By the time the CHECK OIL LEVEL warning appears on the DIC, you're already ~2 quarts low, no oil visible on the dipstick. Not something that will cause immediate engine damage to a Northstar during "normal" use, considering their large oil capacity, but NOT good practice.

  5. #4
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: 98 Oil Leak Repair

    MoistCabbage is right on the money -

    the only thing I would add is the other two possible leaks caused by the
    front and or rear main seals - neither of these are cheap or easy to replace -

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 98 Oil Leak Repair

    Quote Originally Posted by Mj2 View Post
    the only way to repair the oil leak that the northstar is known for............
    And what/where is that leak ? Just as with any other automobile engine, a Northstar can leak/weep oil from a LOT of places.

    NEVER, EVER wait for the car to cry "Help !!" Perform your weekly underhood fluids and condition checks faithfully. YOU catch the problem before the car tells you ......

  7. #6
    Ranger's Avatar
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    Re: 98 Oil Leak Repair

    I would not condemn slipgate for that recommendation. It certainly is good practice to check the oil on a regular basis, but 2 qts low on a Northstar (with a 7.5 qt capacity) is certainly nothing to be too concerned about.

    I would agree that you need to know where the leak is coming from though. As mentioned above, there are several simple possibilities.
    Slipgate and Slipgate like this.

  8. #7
    yellow1 is offline Cadillac Owners Member
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    Re: 98 Oil Leak Repair

    Just replaced my oil pressure sending unit. Was unsure where my oil leak was coming from and was sure it would require engine removal and a 3000 dollar bill. Put it up on jack stands started it up and like magic the oil pressure sending unit started to drip. Not easy to get to but in about a half an hour and a few choice words I had it replaced. Cost 13 bucks and my oil leak was fixed.

  9. #8
    Slipgate is offline Cadillac Owners Enthusiast
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    Re: 98 Oil Leak Repair

    LOL - Yeah I figured this would get some feathers ruffled! But I maintain for the average (lazy?) driver like myself, this is fine and won't do any damage at all to the engine. I used to check oil religiously on a weekly basis with past cars, but as I age, I find I really don't care to do this anymore. And I really don't think a quart or two low on this engine will make any noticeable difference at all. Higher capacity engines typically have more oil to keep bottom end parts lubricated during extended high speed driving when oil tends to collect in the top of the engine. With the way this car is geared, I don't think you'd ever get to this state unless you drive like 90mph plus all the time.

    Quote Originally Posted by MoistCabbage View Post
    Where's it leaking from?

    Oil pressure switch and oil filter adapter leaks are fairly common, and cheap and easy to fix.

    Cam cover leaks are a bit less common. And more difficult/expensive to repair. It's usually a small leak though.

    An oil pan or half case seal leak requires engine removal (or for the engine to be supported from above, and the cradle dropped out from under it). BIG jobs. Fortunately, those seals tend not to do much more than weep, or leak very slowly. And you can buy a LOT of oil for what it would cost to repair.

    ----------

    WRONG!!!
    NEVER wait for a car to give you a warning light/message, instead of doing a simple fluid check every week, or every fill up.

    Use your DIPSTICK to check your oil level, maintain it at half way up the hash marks on the stick (xxxxxXxxxxx).

    .....By the time the CHECK OIL LEVEL warning appears on the DIC, you're already ~2 quarts low, no oil visible on the dipstick. Not something that will cause immediate engine damage to a Northstar during "normal" use, considering their large oil capacity, but NOT good practice.

  10. #9
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 98 Oil Leak Repair

    Just to muddy the water remember that oil, and its quantity/flow, cools every piece of rotating/rubbing machinery inside an engine. Running a Northstar 2 quarts low is sort of equivalent to running your coolant 28% low.

  11. #10
    Mj2
    Mj2 is offline Cadillac Owners Member
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    Well I git a few drops on the ground but I usually have add oil maybe half a quart every two weeks if I do slot of driving, but I Jus don't want my engine to lock up on me like my mechanic says it will one day....by the way it $2500 to get fixed

  12. #11
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 98 Oil Leak Repair

    What gives you, or your "mechanic", the idea that the engine will lock up one day ?

    A few drips a week is a far cry from total oil loss at 60.

    At what level on the dipstick are you adding a half quart ?? Trying to keep a Northstar full to the top of the dipstick hashmark only leads to excessive oil consumption: Read the oil articles up ^^^ in the black bar - Cadillac Technical Archive.

  13. #12
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 98 Oil Leak Repair

    Your mechanic said it will lock up one day because of a rear main oil leak?

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