This might be a better link. http://www.penrite.com.au/pispdf/SIN0W50.pdf
They appear to be race oils.
Personally, I don't like the idea of having the amount of VII's it must have to span that viscosity range (0W-50), unless of course they are using a VII package similar to GC.
The 15W-40 http://www.penrite.com.au/pispdf/SIN15W40.pdf would be my choice for most applications, less VII's, less drag/better power release, closer viscosity to what most engine manufacturers call for.
PDS' for the rest of the range can be found here
I suppose most of the range are continuing Penrite's obsession/philosophy of 'heavier is better'.
Other than that