The Amsoil is probably holding it's viscosity better, therefore not letting as much oil slip past the inner plunger while running.
Oil gets thinner when hot, no matter what it's viscosity is. Some oils get thinner than others. Get 20/50 oil up to 200° and it pours like water. I think the Amsoil is just not getting as thin as the Valvoline you used before.
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Paul Carter
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