Hi, my name is Tomas. I have 2015 Nissan Pulsar 1.2 petrol, manual transmission. In the last couple of weeks I have noticed a strange rattling noise (metal on metal) when accelerating, coming from under the front of the car. The best I can hear it when the radio & fan is off, window(s) pulled down and the traffic around is quiet (no loud noises). I can also hear it with the windows closed. This is happening when the car is still cold and not fully warmed up. After approx. 5 min of driving (depends on the outside temperature) the rattling noise is not really noticable and is hard to hear it. Oil level checked and it's OK. Could you please advise. Thank you