2011 Vito 116 dualiner sport engine noise

[Roberto 163]

Hello everyone & thanks for letting me join the forum & thanks for any help in advance,I have recently bought a 2011 Mercedes Vito 116 dualiner sport lovely van it's done 60,000 miles,I just wanted some advice the engine just seems a bit noisey on tickover on initial cold start there is a slight rattle but disappears after around 5 seconds,but the engine still sounds a bit noisey to me not really bad but just wanted some advice from the experts,this is the first Mercedes I've owned & I plan to keep it for a number of years.
I've changed the oil & filter with the correct MB specified grade & amount it's the first job I do on any car I buy !