On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
If you are planning on sticking with a 10w-60, Gulf or Valoline are probably the best ones.
I have had quite a few TS CAR and have run them on Shell Helix Ultra 5w-40, Gulf Formula G 5w-40, Havoline Synthetic 5w-40 and Motul 8100 5w-40 and had very low oil consumption with all of them.
The volatility of the oil makes a bigger difference to the oil consumption than the viscosity. Synthetics tend to be less volatile than mineral oils as they are engineered that way, however Selenia racing seems like an exception to the rule.
You will never be cool driving a Vauxhall.