Millers have an excellent reputation in the motorsport world. This is their oil for the S65:
http://www.millersoils.co.uk/automot...tor=Motorsport
Millers CFS 10w60
SAE Viscosity 10w60
Specific Gravity (at 15°C) 0.865
Kinematic Viscosity (at 100°C, cSt) 22.7
Kinematic Viscosity (at 40°C, cSt) 159.6
Viscosity Index 171
Pour Point (°C) <-25
Flash Point (°C) >200
Cold Crank Viscosity (cP) 7,000
HTHS mPa.s 5.55
TBN mg KOH/gm 9.47