Question about 1999 Cadillac DeVille

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Oil leaks I took my car to the shop for over 6 months and they sealed the rear main seal and oil pan gasket but it is still leaking from the oil pan.

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After a period of driveing you have to get oil pan re tighting some times improper installion can keep it leaking also.

Posted on Jul 26, 2008

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05 malibu leaking oil from rear of engine


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Dear Sir,
Here is the oil leaking Problem Identifying Technique

Engine oil leaks from the valve cover gasket are common.

  • The intake manifold plenum gasket may leak and cause increased oil consumption/burning and a spark knock during acceleration; the gasket should be replaced.
  • External oil leaks from valve cover gaskets, intake gaskets (front or rear), and the rear crankshaft (rear main) seal area are common. The rear main seal is an unlikely source. Normally, the bearing cap mating surfaces (as well as the sealing surface between the oil pan and bearing cap) are the source for the leaks.
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  • If the oil filter casing shows signs of distortion from excessive oil pressure, theoil pump should be replaced.
  • Often misdiagnosed as a leaking oil filter gasket, the oil filter adapter can seep from between the adapter and engine block.
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  • I think it helps to analyse u r Problem

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    OIL LEAKS UNDER CAR COULD BE COMING FROM LEAKING OIL FILTER OR OIL PAN GASKET.CHECK FOR OIL LEAKS AROUND REAR MAIN OIL SEAL AND FRONT TIMING COVER CRANKSHAFT SEAL LEAKING OR LIP SEAL AT THE LOWER TIMING COVER TO OIL PAN.

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    List of possible locations for engine oil leaks:

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    I have a 1989 honda accord dx with a oil pan gasket leak and a rear main seal leak, in order to fix the rear main seal leak, does the oil pan and the oil pan gasket need to be removed and does the gasket...


    they don't use gaskets on oil sumps its sealant glue and yes u will have to reapply it when you put the sump back on, and what do u mean by main seal? do you mean the head gasket?

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    Oil leaking in engine have replaced seal and O rings but still leaks. I am going to scream!


    ok, There are many areas that the oil could leak from. Head gasket, oil pan gasket, rear main seal, front seal, valve cover gasket. You'll need to locate the leak under the car in order to know which one to replace. There is nothing simple about replacing the rear main seal and although he front seal is easier it can still be a problem. Good Luck.

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    Oil leak at the bottom of the oil pan. Still leaking after i tightend the pan bolt. What should i check next, can this cause other problems?


    Dear Sir,
    Here is the oil leaking Problem Identifying Technique

    Engine oil leaks from the valve cover gasket are common.
  • The intake manifold plenum gasket may leak and cause increased oil consumption/burning and a spark knock during acceleration; the gasket should be replaced.
  • External oil leaks from valve cover gaskets, intake gaskets (front or rear), and the rear crankshaft (rear main) seal area are common. The rear main seal is an unlikely source. Normally, the bearing cap mating surfaces (as well as the sealing surface between the oil pan and bearing cap) are the source for the leaks.
  • Engine oil leaks at the distributor can be misdiagnosed as leaks from the intake manifold seal, oil pan gasket, or rear crankshaft (rear main) seal. A revised distributor is available if oil is found inside the distributor.
  • If the oil filter casing shows signs of distortion from excessive oil pressure, the oil pump should be replaced.
  • Often misdiagnosed as a leaking oil filter gasket, the oil filter adapter can seep from between the adapter and engine block.
  • Carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.

  • I think it helps to analyse u r Problem

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    Could be a rear main seal.

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    Oil leaks


    clean off the area where you suspect the leak is then run and check. The only way to change rear main seal (and have it actually work) is by removing crankshaft. I have seen this attempted at least a hundred times and never seen one yet that didn't leak. Some of the new oils for "older engines" have a seal softener in them tha usually will help but don't expect results for months...it took years for seals to harden & wear.

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    Oil Leak


    i would have to say the oil pan gasket. that is the one that I have replaced more often. it is ever usual for the rear main seal to go out but not impossible. but i would have to say oil pan gasket.
    hope this helps and if you need anything else let me know. happy holidays.

    Tom

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