Among the 3 oils, Castrol RS 10w50, Redline 15w50 or Amsoil 2000series 20w50, which is a better oil?
Redline specs:
Viscosity @ 100°C, cSt = 19.6
Viscosity @ 40°C, cSt = 138
HTHS = 5.8
Amsoil specs:
Viscosity @ 100°C, cSt = 18.3
Viscosity @ 40°C, cSt = 128.1
HTHS = 5.1
Castrol: ??