Rattling in Engine compartment

Guys, Question. In the morning when the car is cold and I start up and start driving while still cold I hear this noise (like when you shake a paint can) I think it goes away after it warms up but do any of you all with the 4 cycle have this in the mornings? I am running mobile 1 synthethic, and 87-octane usually 93 once a month. If it's normal then I don't want to waste my time leaving the car at Mitsu but if you all don't have it I am taking it in Saturday morning.