Great all the interest in this topic:
I used
Amsoil in my road car, its expensive, but they recommend it can stay in for 25000 miles, and becomes good value being a superior
oil, and longer lasting, I dont know whether thats a good idea in a performance car, as
oil changes?
Regarding running a new engine in I use Mobil 20-50 mineral
oil, and normally put the engine on Castrol RS after 3000 miles, but thats been in solid flat tappet camshaft engines.