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After discussing with the laboratory technician from Black Stone, she told me three things:
1 - They do not have cases that the oil cooler brings lead in car (seems they are some issues in maritime oil cooler). This is align with NoHaveMSG comment
2 - if wearing is the problem, it should be others metals.
3 - In engines running leaded gas (like airplanes) you will see PB reading in the thousands, not few hundreds.
Doing more investigation I concluded that I added leaded 110 race gas at track gas pump, back in feb 2020. Maybe less than 5 gallon.
So it is plausible that the 240 ppm comes form that only refilling.
I will redo the analysis in 2000 miles, with at least two track weekend. Pb should go down if my first conclusion are rights.
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