I'm currently running 5W-30 Havoline DS in my GM 5.3L with the Amsoil Ea filter.
My observations are the oil has a clear, light amber color, as poured out of the bottle. Which is good, as the Havoline from an OCI last fall had more of a darker, reddish brown coloration.
Also, the data sheet indicates a 9.7 cSt at 100C viscosity and it is indeed thinner. My normal oil pressure at 60 miles/hr and 1700 rpm is 53 psi with a 30 weight oil.
With 5W-30 Havoline DS, it is 4-5 less at 48-49 psi.