I saw this online the kinematic viscosity
AMSOIL 0W30 is 57.3 cST @ 40 °C, & 11.3 cST @ 100 °C
AMSOIL 5W30 is 59.5 cST @ 40 °C, & 11.7 cST @ 100 °C
AMSOIL 10W30 is 66.1 cST @ 40 °C, & 11.7 cST @ 100 °C
They are all VERY close to each other, so it shouldn't do anything. Shouldn't be too far off on the castrol maybe..
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