High oil consumption (1 quart/week!!)
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Northstar Engines and System Technical Discussion Discussion, High oil consumption (1 quart/week!!) in Cadillac Engine Technical Discussion; The 2000 SLS. I check all the car's fluids weekly. Every time I check the SLS it is below the ...
  1. #1
    dp102288's Avatar
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    High oil consumption (1 quart/week!!)

    The 2000 SLS. I check all the car's fluids weekly. Every time I check the SLS it is below the add mark. This is every single week, which is about only 100-200 miles. So as a test, one week when I noticed it was low, I didn't add any oil that week. The next week, the dipstick had only one drop of oil on it at the bottom. So it seems like it lost another quart!

    Weekly, the engine will take 1 quart, and then puts it near the top (I don't fill it exactly to the top as per the technical archives). My 95 Eldorado is normal, 1 quart of oil every 1000 miles or so.

    What should I do next?

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  3. #2
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: High oil consumption (1 quart/week!!)

    1 qt per 100 miles sounds like a pretty good leak to me.

    I take it this started suddenly?

    Is it leaking by the filter maybe after the last oil change?
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    Re: High oil consumption (1 quart/week!!)

    A qt. per 100 - 200 miles should either be smoking like an old steam engine or leaking like a sieve (sp?) and easy to locate.

  5. #4
    dkozloski's Avatar
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    Re: High oil consumption (1 quart/week!!)

    Sounds like my old pickup. I pull into the gas station and say "Gas, oil, and water; a gallon of each. Just pour the oil on the fender because it's going to leak on the ground anyhow."

  6. #5
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    Re: High oil consumption (1 quart/week!!)

    Inspect the engine for leaks, top to bottom. if it's not leaking it's burning it. pull the plugs and look for crusty build-up.

  7. #6
    Zorb750 is offline Cadillac Owners Connoisseur
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    Re: High oil consumption (1 quart/week!!)

    One to try... jack up the front of the car evenly, and use a cinderblock or something (on a garbage bag so as not to damage the mat) to prop the accelerator at a normal driving RPM (1500 will be great). Look around the oil filter for leaks. There are two o-rings at the back of the adapter plate that can leak, and I have seen these cars with one bolt loose on the adapter plate, causing a similar leak. Usually it won't be so bad as to leak at idle, hence the RPM increase. From idle to about 15-1800 is the single largest increase in oil pressure to RPM ratio.

    Look at the oil pressure/temperature sensor too. They can be loose (seen that one too). Understand that they have a pipe thread, which is tapered, so won't simply tighten until it stops, they get progressively tighter. Just use good judgement dealing with them. As far as tightening goes, it's a real pain with the adapter still on the car. The best thing to do is to try to give it a twist with some med. large channellocks. If it turns at all easily, then disconnect the wire and tighten it, then reconnect it. Do NOT grab it by the plastic sensor body. Mine cracked lengthwise in that place and made a huge mess of the car's underbody on a highway drive. It also dumped about a quart and a half of oil over the course of 25 miles. My sensor was original and never tightened in this manner.

    Also, this one will sound totally braindead, and I am not intending insult, but be sure that the oil filter is tight. I never use tools to tighten them, I give it a good spin (a few drops of oil on the threads instead of just the gasket helps with that), turn it as far as it turns reasonably easily, then give it a half a turn or so by hand. It should still be possible to tighten by hand just a little bit more, but they tighten up a bit so don't. You should be able to JUST BARELY remove it by hand at your next oil change, assuming it's clean and dry.

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    Re: High oil consumption (1 quart/week!!)

    Thanks for the advice. The bad thing is there are no leaks or smoke for the SLS. Left it in the driveway overnight all the time, and nothing under the car, not even a wet spot. Starts up and WOTs with no smoke at all. I can only think the leak is from actual driving, so I wouldn't see it in the driveway.

    Car is becoming a nuisance. Lots more trouble then my Eldo, and my Eldo is way older, has more miles, and works a lot harder (I am a lead foot, and the whole town knows it).

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    Re: High oil consumption (1 quart/week!!)

    If it's leaking while driving the engine would still be wet with oil. If it is wet (with oil) clean it off completly and drive it a short distance and recheck. The oil is going somewhere, it doesn't evaporate.

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    Re: High oil consumption (1 quart/week!!)

    There are oil leak detector kits at NAPA that put a dye in the oil that makes seeing the leaks easier. Worth a try.

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    Re: High oil consumption (1 quart/week!!)

    I agree.

  12. #11
    rugby2 is offline Cadillac Owners Member
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    Re: High oil consumption (1 quart/week!!)

    has anyone ever gotten 150k on their northstar, with no problems?wish I read this site before buying a caddy.

  13. #12
    KHE
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    Re: High oil consumption (1 quart/week!!)

    Sure they have - you rarely hear about them on forums such as this because people rarly seek out a forum to brag how trouble free their car is.

  14. #13
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    Re: High oil consumption (1 quart/week!!)

    Quote Originally Posted by rugby2 View Post
    has anyone ever gotten 150k on their northstar, with no problems?wish I read this site before buying a caddy.
    What problems do you have with yours?

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    Re: High oil consumption (1 quart/week!!)

    Another thing you may want to check, under the intake manifold cover.

    I was checking for fuel leaks recently and discovered about a half inch of
    oil in the bottom of the intake, I cleaned it up and made sure the PCV system
    was clear.

  16. #15
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    Re: High oil consumption (1 quart/week!!)

    Quote Originally Posted by clarkz71 View Post
    What problems do you have with yours?
    See post #90

    http://www.cadillacforums.com/forums...rs-like-9.html

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