Hi everyone İ own a 2007 Alfa Romeo 147 1.9 jtd 16v 150ps. When İ start the car in the morning the car makes a knocking noise. After 20 to 30 mins when the engine gets warm the sound disappears. İ recently took it to the service and change all of the filters and put fresh oil this was before the knocking noise. Does anybody have an idea how can İ fix it.