Cool! The Castrol R30 is an interesting product. It's not straight Castor.
Castrol R30 link
The additives may help with storage.
Somewhere around here I have a post about my castor mix. I use Sig PURE castor mixed with Amsoil Dominator. I totally agree with the positive effects. Only once did I go a little heavy on the Castor in a gasohol mix....not good, I had stringers on the plug fouling it completely.
I'm running Dominator at about 30:1 right now, with 1/4-1/2 oz of Castor/gallon on top of that. Seems like a good fall mix.
Found this: http://motorbicycling.com/f13/got-my...html#post43358