I have a 1999 ford f 150 xlt ext cab, the truck never leaked any oil or used any, then when i change my oil to castrol gtx high mileage i noticed at the end of ever oil change my oil level would drop. I know that there was a problem with the 1997-2003 f150 to leak a lil oil and i see when my truck is on the hoist that back of the motor is wet. any one eles have this problem???