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Reply to "recent oil sample"

I am not sure what other tests were done on the oil sample or what advice the lab gave. The calcium and phosphorus is possibly from the detergent and antiwear package in the oil. Iron is typically from wear metal - but hard to judge if it is too high or not.
Sodium and potassium can be from a previous coolant leak. Silicon can either be part of dirt ingression (look at aluminium as well) or silicates from the coolant. The high copper can be corrosion from the cooling system. Has the cooling system been checked or the coolant checked?
High copper can also be the result of stray current corrosion - due to the earth path changed or some after market electrical accessory fitted.
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