I received the UOA on my truck today, 7500 miles on Valvoline Premium Blue 15w40 with no makeup oil required. Although it looks like a good report, the oil additives are not what I expected for Valvoline PB CI-4+ specification. I thought the CI-4+ formulation was virtually the same as the CI-4. A previous UOA I have from 5 years ago on PB CI-4 had 3578 calcium, 30 magnesium, 102 boron and 1480 zinc.
Where could the silver come from in this engine?
Miles on truck.........60000
Miles on oil............7500
Oil......................Valvoline Premium Blue 15W-40 CI-4+
Parameter.......Universal Average ~6500miles.... UOA Results
Aluminum.......................3.....................2
Chromium.......................2.....................1
Iron..............................23....................13
Copper...........................4.....................2
Lead.............................2.....................1
Tin...............................1.....................0
Molybdenum....................28....................31
Nickel............................0.....................0
Manganese......................0.....................0
Silver............................0.....................3
Titanium........................0.....................0
Potassium.......................3.....................4
Boron...........................81....................44
Silicon...........................7.....................3
Sodium..........................4.....................1
Calcuim.......................2758..................1949
Magnesium....................239...................794
Phosphorous..................1081...................994
Zinc...........................1272..................1184
Barium..........................1.......................0
SUS vis at 210 F............69 to 79..................68.7
cSt at 100 C................12.7-15.3.................12.61
Flashpoint....................>390.....................435
Fuel.......................... Antifreeze......................0%......................0
Water........................ Insolubles.....................<0.8....................0.1
Where could the silver come from in this engine?
Miles on truck.........60000
Miles on oil............7500
Oil......................Valvoline Premium Blue 15W-40 CI-4+
Parameter.......Universal Average ~6500miles.... UOA Results
Aluminum.......................3.....................2
Chromium.......................2.....................1
Iron..............................23....................13
Copper...........................4.....................2
Lead.............................2.....................1
Tin...............................1.....................0
Molybdenum....................28....................31
Nickel............................0.....................0
Manganese......................0.....................0
Silver............................0.....................3
Titanium........................0.....................0
Potassium.......................3.....................4
Boron...........................81....................44
Silicon...........................7.....................3
Sodium..........................4.....................1
Calcuim.......................2758..................1949
Magnesium....................239...................794
Phosphorous..................1081...................994
Zinc...........................1272..................1184
Barium..........................1.......................0
SUS vis at 210 F............69 to 79..................68.7
cSt at 100 C................12.7-15.3.................12.61
Flashpoint....................>390.....................435
Fuel.......................... Antifreeze......................0%......................0
Water........................ Insolubles.....................<0.8....................0.1