Hello,

When I first start my 6.0 engine there is a noisy engine sound as if valves are taping for maybe 1 sec.

Is this a common problem or what have you heard about it.

The local GM garage says that they cannot here it and that they have no bulletins on it.

I know it is there especially when I make a cold start.

Using GM oils and filter and it only has 4400 miles

Thanks
Jimmy