Outer Limits 4x4 Board

Can someone please tell me what the required oil spec is for a TD42, as I dont have my Gregories or Owners manual with me and am going to grab some oil after work. I was going to get the Caltex Delo Silver (old 500) which is recommended for CG-4 or CF-4 ratings...there is also the Delo 400, which I think is more $$$, but that is a CH-4..... both are 15W 40's

anyone know what the required spec is for the TD42.... Cheers