Seriously? You bring THIS back from the dead for your first ever post?For anyone else searching for this info, the Discovery II service manual recommends the following:
Engine oil - V8 - North America
Use a 5W/30, 5W/40 or 10W/40 oil meeting specifications API SH or SJ, having a viscosity band suitable for the temperature range of your locality.
Temp range for 10W/40: approx 10 - 120 deg F
Temp range for 5W/40: -20 - 120 deg F
Temp range for 5W/30: -20 - 90 deg F