Low oil light came on so I took my cat a had oil changed. Brought to my work and liw oil pressure light came on. Checked oil and it looked like there was 2 quarts to much. Took it back to where oil was changed and they said I had water in my oil. So they did another oil change and it did the same thing right whenI picked it up. Have not drove it since. What should I do or what can it be and can I put Blue Devil Gasket Sealant in my motor.