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Technical specifications for castrol and valvoline are attached, can this be a reason for decreased pressure with VR1 over Castrol?
Viscosity in vr1 is 23 vs 24 in castrol at 100C
and 158 vs 157 at 40C respectively, so cold VR1 is actually thicker.
Viscosity index is just as close. So I guess it should not matter?