Car Problem Reports

Cadillac Seville SLS Oil Leaks From Lower Engine Area

Cadillac Seville SLS Problem
38 Reports
Me Too

Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004

Average Mileage: 97,777 mi (30,800 mi - 214,000 mi)


The engine may develop an oil leak from the lower crankcase portion of the engine block. Our technicians tell us that the engine must be removed from the vehicle to properly repair this oil leak.

  •  Rookie

    Always having to add oil even about a month after oil change. I know Northstar engines burn oil, but then I noticed underneath of car was wet with oil. (never dripped on driveway until recently). The mechanic changed a bolt or nut that goes under there, but it continued. Mechanic says that I probably have an oil pan gasket leak and that is major work to fix. Tells me to get a new car, but I can't afford one right now.

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  • Visitor, , 100,000 mi

    Cadillac dealer quoted me 5000 dollars leaking from lower case. Engine must be removed.

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  • live with it

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  •  Rookie

    It has not been fixed, I do not know the cost to fix it, but Raben told me the rear main seal has developed an oil leak, and I want the issue fixed and I want an idea on the cost to fix the problem.

    The cost at the Cadillac dealer: $2000. It's a 14 hour job and the engine and transmission must be separated to access the rear main seal. Also the A/c just failed after being recharged. That brings the total to $3000 of repairs.

    Dear GM, The northstar engine was supposed to be the next best thing to sliced bread, but it is a piece of crap at 99000 miles. You have just lost a customer and we replaced the SLS with a new Hyundai Sonata Limited. Build better cars GM.

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  • Visitor, , 35,000 mi

    its a minor leak therefore I haven't invested in a repair yet. The car has only 87000 miles at this particular time.

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  • Visitor, , 48,000 mi

    B bank sensor error code p0385 car stumbles and code sets i/m light turns on.

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  • Visitor, , 140,000 mi

    Still leaks. Cheaper to keep adding oil. $3,000.00 to fix. Must pull engine.

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  • Visitor, , 126,000 mi

    Not fixed, too expensive to do now. Have to have engine pulled and new gasket. Small leak just keeping an eye on oil level keeping it topped out.

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  • norstar engines still leaks after spending $1000 on repairs need new engine

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  • Visitor, , 90,000 mi

    I have to park on card board all the time and don't really need an oil change because I am always putting oil in the car.

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