Oil in the cooling reservoir











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I have milky white oil in the cooling reservoir. The vehicle in question is a BMW 318i and was bought 5 days ago.



What would be the most like cause?










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  • Hi and welcome to mechanics.stackexchange. Your question needs a little clarification because it is hard to be understood.
    – kokobill
    Nov 22 at 7:35










  • What year is it? Other than the head gasket, a common point of failure on BMW motors that can cause oil and coolant to mix is the oil filter housing gasket. Are there any visible signs of oil leaking on the motor? Note, if the engine has been steam cleaned, I'd be suspicious as to why at this point.
    – Comintern
    Nov 22 at 16:36















up vote
2
down vote

favorite












I have milky white oil in the cooling reservoir. The vehicle in question is a BMW 318i and was bought 5 days ago.



What would be the most like cause?










share|improve this question
























  • Hi and welcome to mechanics.stackexchange. Your question needs a little clarification because it is hard to be understood.
    – kokobill
    Nov 22 at 7:35










  • What year is it? Other than the head gasket, a common point of failure on BMW motors that can cause oil and coolant to mix is the oil filter housing gasket. Are there any visible signs of oil leaking on the motor? Note, if the engine has been steam cleaned, I'd be suspicious as to why at this point.
    – Comintern
    Nov 22 at 16:36













up vote
2
down vote

favorite









up vote
2
down vote

favorite











I have milky white oil in the cooling reservoir. The vehicle in question is a BMW 318i and was bought 5 days ago.



What would be the most like cause?










share|improve this question















I have milky white oil in the cooling reservoir. The vehicle in question is a BMW 318i and was bought 5 days ago.



What would be the most like cause?







engine bmw head-gasket






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 22 at 9:32









Martin

5,00711130




5,00711130










asked Nov 22 at 3:31









wahed

161




161












  • Hi and welcome to mechanics.stackexchange. Your question needs a little clarification because it is hard to be understood.
    – kokobill
    Nov 22 at 7:35










  • What year is it? Other than the head gasket, a common point of failure on BMW motors that can cause oil and coolant to mix is the oil filter housing gasket. Are there any visible signs of oil leaking on the motor? Note, if the engine has been steam cleaned, I'd be suspicious as to why at this point.
    – Comintern
    Nov 22 at 16:36


















  • Hi and welcome to mechanics.stackexchange. Your question needs a little clarification because it is hard to be understood.
    – kokobill
    Nov 22 at 7:35










  • What year is it? Other than the head gasket, a common point of failure on BMW motors that can cause oil and coolant to mix is the oil filter housing gasket. Are there any visible signs of oil leaking on the motor? Note, if the engine has been steam cleaned, I'd be suspicious as to why at this point.
    – Comintern
    Nov 22 at 16:36
















Hi and welcome to mechanics.stackexchange. Your question needs a little clarification because it is hard to be understood.
– kokobill
Nov 22 at 7:35




Hi and welcome to mechanics.stackexchange. Your question needs a little clarification because it is hard to be understood.
– kokobill
Nov 22 at 7:35












What year is it? Other than the head gasket, a common point of failure on BMW motors that can cause oil and coolant to mix is the oil filter housing gasket. Are there any visible signs of oil leaking on the motor? Note, if the engine has been steam cleaned, I'd be suspicious as to why at this point.
– Comintern
Nov 22 at 16:36




What year is it? Other than the head gasket, a common point of failure on BMW motors that can cause oil and coolant to mix is the oil filter housing gasket. Are there any visible signs of oil leaking on the motor? Note, if the engine has been steam cleaned, I'd be suspicious as to why at this point.
– Comintern
Nov 22 at 16:36










2 Answers
2






active

oldest

votes

















up vote
6
down vote













Welcome to Mechanics SE! A white milky, mayonnaise like substance is indicative of oil and water mixing. This could be down to a failed cylinder head gasket or a failed oil cooler. I'm not sure if your car has an oil cooler but the first thing I'd do would be to have the engine either compression or leak down tested. Either of these tests ought to indicate the condition of your cylinder head gasket.






share|improve this answer




























    up vote
    5
    down vote













    Textbook root cause nr. 1 would be a damaged head-gasket,
    other possible issues are:




    • Cracks in the engine head or, heaven forbid, the engine block.

    • Some issues with the oil heat exchanger (if equipped)

    • Issues with the transmission cooler (if equipped)


    Either way this is something serious, I would try to rollback the purchase (if possible) or let someone fix the issue (costly).






    share|improve this answer

















    • 1




      You've been sold a car with issues @wahed, get your money back ASAP!
      – GdD
      Nov 22 at 11:26










    • @GdD that depends where the OP is located. In some countries, things are sold as is and no returns can be made once the sale is complete. It's up to the buyer to ensure what the buying satisfies their needs.
      – BossRoss
      Nov 22 at 14:51










    • He can try @BossRoss.
      – GdD
      Nov 22 at 14:58











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    2 Answers
    2






    active

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    2 Answers
    2






    active

    oldest

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    active

    oldest

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    active

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    up vote
    6
    down vote













    Welcome to Mechanics SE! A white milky, mayonnaise like substance is indicative of oil and water mixing. This could be down to a failed cylinder head gasket or a failed oil cooler. I'm not sure if your car has an oil cooler but the first thing I'd do would be to have the engine either compression or leak down tested. Either of these tests ought to indicate the condition of your cylinder head gasket.






    share|improve this answer

























      up vote
      6
      down vote













      Welcome to Mechanics SE! A white milky, mayonnaise like substance is indicative of oil and water mixing. This could be down to a failed cylinder head gasket or a failed oil cooler. I'm not sure if your car has an oil cooler but the first thing I'd do would be to have the engine either compression or leak down tested. Either of these tests ought to indicate the condition of your cylinder head gasket.






      share|improve this answer























        up vote
        6
        down vote










        up vote
        6
        down vote









        Welcome to Mechanics SE! A white milky, mayonnaise like substance is indicative of oil and water mixing. This could be down to a failed cylinder head gasket or a failed oil cooler. I'm not sure if your car has an oil cooler but the first thing I'd do would be to have the engine either compression or leak down tested. Either of these tests ought to indicate the condition of your cylinder head gasket.






        share|improve this answer












        Welcome to Mechanics SE! A white milky, mayonnaise like substance is indicative of oil and water mixing. This could be down to a failed cylinder head gasket or a failed oil cooler. I'm not sure if your car has an oil cooler but the first thing I'd do would be to have the engine either compression or leak down tested. Either of these tests ought to indicate the condition of your cylinder head gasket.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 22 at 9:45









        Steve Matthews

        19.5k22969




        19.5k22969






















            up vote
            5
            down vote













            Textbook root cause nr. 1 would be a damaged head-gasket,
            other possible issues are:




            • Cracks in the engine head or, heaven forbid, the engine block.

            • Some issues with the oil heat exchanger (if equipped)

            • Issues with the transmission cooler (if equipped)


            Either way this is something serious, I would try to rollback the purchase (if possible) or let someone fix the issue (costly).






            share|improve this answer

















            • 1




              You've been sold a car with issues @wahed, get your money back ASAP!
              – GdD
              Nov 22 at 11:26










            • @GdD that depends where the OP is located. In some countries, things are sold as is and no returns can be made once the sale is complete. It's up to the buyer to ensure what the buying satisfies their needs.
              – BossRoss
              Nov 22 at 14:51










            • He can try @BossRoss.
              – GdD
              Nov 22 at 14:58















            up vote
            5
            down vote













            Textbook root cause nr. 1 would be a damaged head-gasket,
            other possible issues are:




            • Cracks in the engine head or, heaven forbid, the engine block.

            • Some issues with the oil heat exchanger (if equipped)

            • Issues with the transmission cooler (if equipped)


            Either way this is something serious, I would try to rollback the purchase (if possible) or let someone fix the issue (costly).






            share|improve this answer

















            • 1




              You've been sold a car with issues @wahed, get your money back ASAP!
              – GdD
              Nov 22 at 11:26










            • @GdD that depends where the OP is located. In some countries, things are sold as is and no returns can be made once the sale is complete. It's up to the buyer to ensure what the buying satisfies their needs.
              – BossRoss
              Nov 22 at 14:51










            • He can try @BossRoss.
              – GdD
              Nov 22 at 14:58













            up vote
            5
            down vote










            up vote
            5
            down vote









            Textbook root cause nr. 1 would be a damaged head-gasket,
            other possible issues are:




            • Cracks in the engine head or, heaven forbid, the engine block.

            • Some issues with the oil heat exchanger (if equipped)

            • Issues with the transmission cooler (if equipped)


            Either way this is something serious, I would try to rollback the purchase (if possible) or let someone fix the issue (costly).






            share|improve this answer












            Textbook root cause nr. 1 would be a damaged head-gasket,
            other possible issues are:




            • Cracks in the engine head or, heaven forbid, the engine block.

            • Some issues with the oil heat exchanger (if equipped)

            • Issues with the transmission cooler (if equipped)


            Either way this is something serious, I would try to rollback the purchase (if possible) or let someone fix the issue (costly).







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 22 at 9:46









            Martin

            5,00711130




            5,00711130








            • 1




              You've been sold a car with issues @wahed, get your money back ASAP!
              – GdD
              Nov 22 at 11:26










            • @GdD that depends where the OP is located. In some countries, things are sold as is and no returns can be made once the sale is complete. It's up to the buyer to ensure what the buying satisfies their needs.
              – BossRoss
              Nov 22 at 14:51










            • He can try @BossRoss.
              – GdD
              Nov 22 at 14:58














            • 1




              You've been sold a car with issues @wahed, get your money back ASAP!
              – GdD
              Nov 22 at 11:26










            • @GdD that depends where the OP is located. In some countries, things are sold as is and no returns can be made once the sale is complete. It's up to the buyer to ensure what the buying satisfies their needs.
              – BossRoss
              Nov 22 at 14:51










            • He can try @BossRoss.
              – GdD
              Nov 22 at 14:58








            1




            1




            You've been sold a car with issues @wahed, get your money back ASAP!
            – GdD
            Nov 22 at 11:26




            You've been sold a car with issues @wahed, get your money back ASAP!
            – GdD
            Nov 22 at 11:26












            @GdD that depends where the OP is located. In some countries, things are sold as is and no returns can be made once the sale is complete. It's up to the buyer to ensure what the buying satisfies their needs.
            – BossRoss
            Nov 22 at 14:51




            @GdD that depends where the OP is located. In some countries, things are sold as is and no returns can be made once the sale is complete. It's up to the buyer to ensure what the buying satisfies their needs.
            – BossRoss
            Nov 22 at 14:51












            He can try @BossRoss.
            – GdD
            Nov 22 at 14:58




            He can try @BossRoss.
            – GdD
            Nov 22 at 14:58


















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