Does this happened with your X5

[J.Seven]

When the engine is cold and i start it, for one seconds the engine makes a strange noise, like if the oil didn´t reach the engine head. After one second engine works very smooth. it doesn´t happend always maybe four times a week. I´ve checked the oil level and it´s ok!!!!!

My previous Porsche 996 Carrera use to make this same kind of noise and Porsche tech said it was normal

J.Seven