I've seen and heard of HP/ET benefits, mileage improvements, lower temps and my trans builder said to keep using whatever I had for my 904's.

Been using Amsoil for year and am very happy with it. Their Dominator series of racing oil has 3 choices of viscosity and has plenty of zinc. (Well, actually 4 if you count their 60w.)

Amsoil bulletin on zinc and their racing oils.

Amsoil source and info site.

Last edited by Locomotion; 09/18/10 02:05 PM.