How about, Hi-Tec Oils in Australia.
They have a line of racing oils called SHP (super high performance) rated API SN
SHP 50 (20W50, 2200 ppm Zn, TBN = 7.65)
SHP 60 (25W60, 1500 ppm Zn, TBN = 7.62)
SHP 70 (25W70, 1500 ppm Zn, TBN = 7.62)
WRT foaming
Quote:
ARRESTS FOAM DEVELOPMENT. The rapid circulation of engine oil in racing engines quickly tends to promote undesirable foam formation. If not arrested, foam can quickly lead to engine seizure since the air/oil foam mixtures cannot sustain effective lubrication. Hi-Tec SHP Racing 60 is fortified with a combination of special foam inhibitors which eliminate foam development so that full-bodied lubrication is realised under arduous competition racing conditions.