You never know what you might learn.....

http://www.aus-cartalk.com/viewtopic.php?t=26425
Just to edit my response too - it varies from car to car, and application to application.
I used to use castrol magnatec preturbo - which reminds me - Jules - do you want a small bottle to keep in the boot for top ups???
Now I've gone turbo I use castrol Edge 5W30.
Others will recommend Mobil 1, or Shell Synthetic, or whatever.....
So it varies....