Rattle on startup

my S2 was siiting in my garage for about a week and when I started the engine, it rattled slightly before settling to a normal idle… sounded like not enough oil on the tappets… I have checked the oil level and that seems fine… anyone else seen this after the car has been standing or any suggestions as to cause ?

Is it ok when warm and oil has circulated?

If so don’t worry.

yes… fine… no probs when warm…