changed oil, drove to south haven, did 7 30-minute track sessions at 270-279 degree oil on 0w20 synthetic signature. oil cooler going in today, but sent oil to blackstone to see what they had to say... pretty great results IMHO.
AMSOIL SAE 0W-20 Signature Series 100% Synthetic Motor Oil
AMSOIL SAE 0W-20 Signature Series 100% Synthetic Motor Oil