well I took my car out today and gave it a bit here and there and no sounds immediately afterwards. Was quite pleased.

Then I went out again for a ride (probably 20 mins ago) and drove normally and the sound was there. I'm thinking to myself could it be that the temperatures really cold and its affecting something in my engine bay or even the engine itself ? And I always warm up my engine before driving off (about 1 min or till the tacho reads almost 1k). Cause now when i look back on it the sound only appears at night when its dead-set cold (and ATM where I am its like bloody 5 degrees outside :S).

Can anyone help me with this ?