Mixing Oil to top off?

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As an aside, many current vehicles have turbocharged engines. Many/most of those
have oil coolers and oil feed lines to the turbo and the cooler. A good bit of oil in those lines
that mixes with the new fill.

My 2¢
 
But don't all oils basically have "ALL" the same stuff in them? You know, boron, zinc etc??? Now if one oil has moon dust in it, that might not work.
No, not even close. For instance, moly may show up on a UOA, but you have zero idea which of the dozens of available moly compounds were used in the oil. Different compounds are chemically different and react with other chemical compounds differently.
 
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