2004 Mazda6 S 3.0L Engine Problems Help..

I have a 2004 Mazda6 S. 3.0L., when I first start it it runs ok, after a few minutes when the motor warms up, it begins to release smoke, a few minutes later the Oil Pressure light begins to flash, I am not sure what it is, have anyone had this type of problem? If so, please tell me what maybe causing this problem. Thank you.... Teemazda6
 
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