Here are the elements from my UOA vendor and their most likely source.
[FONT=Arial,Helvetica,Geneva,Sans-serif][SIZE=+1]UNDERSTANDING THE ELEMENTS[/SIZE][/FONT]
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[FONT=Arial,Helvetica,Geneva,Sans-serif]Gas/Diesel Engines[/FONT]
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[FONT=Arial,Helvetica,Geneva,Sans-serif]Elements[/FONT][FONT=Arial,Helvetica,Geneva,Sans-serif] are quantified in the oil at part per million levels (PPM). This list shows the most common sources of the elements in a gasoline or diesel engine oil. [/FONT]
[FONT=Arial,Helvetica,Geneva,Sans-serif]Aluminum: Pistons, bearings, cases (heads & blocks).
Chromium: Rings, a trace element in steel.
Iron: Cylinders, rotating shafts, the valve train, and any steel part sharing the oil.
Copper : Brass or bronze parts, copper bushings, bearings, oil coolers, also an additive in some gasoline engine oils.
Lead: Bearings.
Tin : Bearings, bronze parts, piston coatings.
Molybdenum: Anti-wear additive, coating on some new rings
(washes off as break-in occurs).
Nickel : Trace element in steel.
Manganese: Trace element, additive in gasoline.
Silver: Trace element.
Titanium: Trace element.
Potassium: Antifreeze inhibitor, additive in some oil types.
Boron: Detergent/dispersant additive, antifreeze inhibitors.
Silicon : Airborne dirt, sealers, gaskets, antifreeze inhibitors.
Sodium: Antifreeze inhibitors, additive in some gasoline engine oils.
Calcium : Detergent/dispersant additive.
Magnesium: Detergent/dispersant additive.
Phosphorus: Anti-wear additive.
Zinc : Anti-wear additive.
Barium: Detergent/dispersant additive.[/FONT]