Calcium Variations

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Does anyone know why there have been variations in Calcium with certain M1 UOA's? I'm thinking that some of the UOA's are with older batches. Mobil aparently reformulated and has increased the calcium level. The 0w-40 UOA only has 1,700 while the 10w-30 has over 3k. Quite a difference.
 
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Buster, this might be a lab issue, too. Note the significant variations in Calcium ion concentration in the various VOA reports on the Castrol 0w-30, done by Blackstone.
 
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