[928uk] Valvoline VR1

[Donald Peach]

I think that at one stage Valvoline VR1 SAE 20/50 engine oli was 
recommended for our V8s due to the high zinc content. Looking at the VR1 
Racing Oil now, it seems it is a new formulation, but still with a high 
(? high enough?) zinc content. Is this still okay for the 928, or should 
I go with the 2013 article on the 928.org site which seems to suggest 
that the Porsche Classic 10/50 might be better?

Best regards,

Don.