Yes, I use it. It's a very good oil. Thanks for confirming the castor %, I was not sure so I have been mixing it 1:1 with Fuchs Arosave synthetic. I'll try with only 927 and see what happens, my ring should tell quickly if it needs more synth in mix.
To me it came from team racing people, and they say it's good. Very little carbon deposit. Actually so little that they add some Klotz Benol castor in the mix to get that healthy tan in piston.
Lauri