Oil sample results from Sunoco Diamond 40W (20 ppm magnesium, 776 phosphorus, and 796 ppm zinc), Harley Davidson 40W (P and Zn at ~1200 plus a whopping 3262 barium), and Arco Graphite 10W/40 oil with 2013 ppm calcium, 1441 phos, and 1433 zinc.