Find the oil leak

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Northstar Engines and System Technical Discussion Discussion, Find the oil leak in Cadillac Engine Discussion; Have a 99 SLS with 112,000 miles. So far no head gasket problem but I do have my fingers crossed. ...
  1. #1
    stutz427 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Sep 2006

    Find the oil leak

    Have a 99 SLS with 112,000 miles. So far no head gasket problem but I do have my fingers crossed. Recently though I notice a burnt oil smell when I idle or go slow. I have looked underneath and can,t find the leak. Its not real big yet but would like to see what I can do with it. For those of you that have had leaks, where do most of them come from? Remember I am dripping onto the exhaust somewhere. Is there an easy way to discover the source of the leak besides dropping the cradle? Thanks

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  3. #2
    [NortHStaR]'s Avatar
    [NortHStaR] is offline Cadillac Owners Fanatic
    Automobile(s): 1999 Cadillac DeVille
    Join Date
    Aug 2008
    Phoenix, AZ

    Re: Find the oil leak

    That would prob. be your halfcase my friend, and to get to it you must pull the motor (out the top or out the bottom which ever you want) seperate the trans. from the motor, pull off the oil pan, remove some stuff up in there and unbolt the halfcase.

    I would wait until your head gaskets go and do the case then.

    Hope I helped.

  4. #3
    chubbyranger is offline Cadillac Owners Connoisseur
    Automobile(s): 99 Seville STS, 08 STS4 N* 1SG F55
    Join Date
    Apr 2007
    The Ocean State

    Re: Find the oil leak

    Besides half case about the only other common oil leak is the pan gasket. Check the bolt torque.

  5. #4
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
    Join Date
    Jul 2007

    Re: Find the oil leak

    Rear main seal - drips down onto the exhaust crossover pipe

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