Originally Posted by griffo
I recommend Valvoline VR1 Racing 20-50.

Seconded. I use in the Morgan and MG. Little more pricey, but after much research found that it was also recommended by many of those with much more knowledge than me.

1972 4/4 4 seater, 1981 MGB GT
1984 Harley Davidson Electra Glide, 1990 Kawasaki ZX10