I was just looking at the PQIA oil test results and noticed that Castrol GTX 5W-20 was tested in 2016 and 2017 with different results showing as the 2017 shows TBN at 8.68 Calcium at 2,668 ppm Boron 195 Zinc 817 Molybdenum 86. The 2016 test shows TBN 7.71 Calcium 2,344 ppm Boron 80 Zinc 827 PQIA Molybdenum <1 . Looks like some slight changes were made from 2016 to 2017 .