Browsing the first 6 pages of the UOA section and found the following calcium contents, from lowest to highest:
1100 ppm - M1 5w30
1100 ppm - M1 EP 5w30
1100 ppm - M1 HM 5w30
1300 ppm - GM dealer bulk 5w30
1700 ppm - ACDelco 5w30
1700 ppm - Castrol Euro 0w40
1750 ppm - PP Euro L 5w30
2000 ppm - PP HM 5w30
2100 ppm - Castrol Edge EP 5w30
2100 ppm - VSP 5w30
2100 ppm - Kendall GT-1 5w30
2300 ppm - PP 5w30
2300 ppm - PP Euro 0w40
2400 ppm - PUP 5w30
2400 ppm - Castrol Edge 0w40
2500 ppm - Castrol Edge 0w30
3000 ppm - M1 0w40
3300 ppm - Amsoil SSO 5w30
1100 ppm - M1 5w30
1100 ppm - M1 EP 5w30
1100 ppm - M1 HM 5w30
1300 ppm - GM dealer bulk 5w30
1700 ppm - ACDelco 5w30
1700 ppm - Castrol Euro 0w40
1750 ppm - PP Euro L 5w30
2000 ppm - PP HM 5w30
2100 ppm - Castrol Edge EP 5w30
2100 ppm - VSP 5w30
2100 ppm - Kendall GT-1 5w30
2300 ppm - PP 5w30
2300 ppm - PP Euro 0w40
2400 ppm - PUP 5w30
2400 ppm - Castrol Edge 0w40
2500 ppm - Castrol Edge 0w30
3000 ppm - M1 0w40
3300 ppm - Amsoil SSO 5w30