Here's a VOA/7.5K UOA of RP 5W20 done at the same time from the same batch of oil, at the same lab last year. It still had a 10 TBN at 7.5K! And it was still well into high grade 20 category. No complaints on this oil from me!!
Properties
Virgin/7500 mile OCI (Same batch)
'05 F-150HD, 5.4L V8, 18,966 miles
Lab: WearCheck
OCI- 7463 mi/14.5 months
Previous Oil & Filter MC 5W20/MC FL820S
Makeup Oil: 0
Oil Capacity 7 qts.
Oil Filter: MC FL820S
Silicon: 0/19
Potassium: 8.5/5/1
Sodium: 7.1/15
Fuel %: 0/ Glycol: 0/0
Water: Sulfation: 0/23% of max
Nitration: 0/16 % of max
Boron: 14/5.9
Barium: 1.3/0
Calcium: 2524/2280
Magnesium: 1252/1164
Moly: 170/118
Phosphorus: 872/825
Zinc: 862/908
Vis @ 40C: 50.83/--
Vis @ 100C: 9.31 cSt/8.9 cSt
VI: 168/--
Oxidation:0/27 % of max
TBN: 13.6/10.0
Iron: 3.7/28
Nickel: 0.5/0.5
Chromium: 0/1.7
Titanium: 0/0.2
Copper: 0.1/4.4
Aluminum: 1.3/5.3
Lead 1.4/0
All other values: 0