Cold start engine noise sounds rotational this has been happening a while now and cannot seem to get to the bottom of it since this started I have had the car in to the garage and had a genuine Audi cambelt changed along with all tensioners etc. The garage has removed the auxiliary belt and started the car and the noise still remains. This noise only happens when the engine is cold and when it warms up it disappears but only when engine is at full temp. I have also changed the oil thinking maybe the existing oil may of been too thick causing it to take time until it was thinner to circulate the engine. The car is a 2015 Audi A3 2.0tdi 150hp
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