Well I collceted my new 997S Friday and have discovered this great site full of a wealth of information from porsche enthusiasts!

I have a question. I've noticed when I switch on the cars engine from cold it makes a fairly noisy knocking/rattling noise for about 5-10 seconds. It seems to settle quickly and once the engine is warm it growls beautifully. Is this normal or should I be concerned? This is my first porsche so I don't really know what to expect!

Stewart