Here's another suggestion.
Check out the Amsoil 5W40 diesel oil.
Quite a few folks are switching to 5W40. This viscosity on this one is thicker at 100C than the Euro 5W40 and it has a higher High Temp High Shear.
I might be trying Amsoil my next change.
edit: If you have cats, I wouldn't run the 5W30 HDD. It has higher levels of detergents and anti-wear additives than the diesel 5W40 (DEO). The DEO is for use in applications where API CJ-4 (the latest diesel spec)
is required. edit again: Oh, you're catless!
FYI, for catted people then.