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Synlube viscosity?

I was asked how I messured 2 different synlube samples both labeled 5w50.

I use like most oil mfgs ASTM D 445. Look up routine it is very detailed as to test setup and protocol I follow it exactly with cannon calibrated tubes etc give me credit for doing this right. Question still stands I have 2 different samples that are NOT 50 wt why?
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