Oil sample results from Mobil Special 10W/30 (58 ppm boron, 664 ppm calcium, 1129 ppm phosphorus, and 1262 ppm zinc), Mobil Arcitc 20-20W (26 ppm calcium, 890 ppm phosphorus, 546 ppm zinc, and 3099 ppm barium!), as well as Phillips Trop-Arctic 10W/40 (4512 ppm calcium, 1519 ppm phosphorus, and 1551 ppm zinc, as well as a tiny magnesium - 11 ppm).