This is my third UOA posting and the fourth oil change for my truck. The truck is a 2012 Chevy Silverado 5.3L V8. The truck has 21531miles total and 5065 miles on the oil at time of change. Oil was PP 5W-30 SN + 1/2 can of liqui-moly MoS2. Filter was a Puro classic that I had previously posted had multiple tears in the media. OLM was at 12%.
http://www.bobistheoilguy.com/forums/ubb...l_f#Post3338994
No make up oil has been needed for any of these oil changes.
This truck sees daily very short trips and some longer trips ~ once a week or every other week.
Code:
DATE SAMPLED 09-Apr-13 24-July-13 XX-April-2014
Oil PP 5w-30 PP 5w-30 PP 5w-30
Miles on OCI 4478 6083 5065
Miles on unit 10383 16466 21531
OLM 29% 22% 12%
Metals (ppm)
Iron (Fe) 38 32 28
Chromium (Cr) 2 2 2
Lead (Pb)
Copper (Cu) 181 109 93
Tin (Sn)
Aluminium (Al) 6 6 7
Nickel (Ni)
Silver (Ag)
Titanium (Ti)
Vanadium (V)
Contaminants (ppm)
Silicon (Si) 25 14 7
Sodium (Na) 5 4
Potassium (K)
Water (%) 0.20
Coolant No No No
Additives (ppm)
Magnesium (Mg) 9 7 14
Calcium (Ca) 2260 2450 2360
Barium (Ba)
Phosphorus (P) 701 669 669
Zinc (Zn) 787 827 796
Molybdenum (Mo) 61 58 119
Boron (B) 15
Physical Tests
Viscosity (cSt 100C) 10.0 10.9 10.9
Physical / Chemical
Base Number (mgKOH/g) 4.2 3.5 4.0
Here is what the lab said:
All wear rates normal. Abrasive and other contaminant
levels are acceptable. Viscosity within specified
operating range.
Action: Resample next service interval to further
monitor.
This is ALS labs in Portland, OR. All things look good continuing to trend down even though I reported that the oil filter had multiple tears. This tells me that even though tears are not a good thing that their effects might be not that great or even minimal. The OLM at 12% shows the oil still has life with good TBN retention even though this truck sees short trips all the time.
http://www.bobistheoilguy.com/forums/ubb...l_f#Post3338994
No make up oil has been needed for any of these oil changes.
This truck sees daily very short trips and some longer trips ~ once a week or every other week.
Code:
DATE SAMPLED 09-Apr-13 24-July-13 XX-April-2014
Oil PP 5w-30 PP 5w-30 PP 5w-30
Miles on OCI 4478 6083 5065
Miles on unit 10383 16466 21531
OLM 29% 22% 12%
Metals (ppm)
Iron (Fe) 38 32 28
Chromium (Cr) 2 2 2
Lead (Pb)
Copper (Cu) 181 109 93
Tin (Sn)
Aluminium (Al) 6 6 7
Nickel (Ni)
Silver (Ag)
Titanium (Ti)
Vanadium (V)
Contaminants (ppm)
Silicon (Si) 25 14 7
Sodium (Na) 5 4
Potassium (K)
Water (%) 0.20
Coolant No No No
Additives (ppm)
Magnesium (Mg) 9 7 14
Calcium (Ca) 2260 2450 2360
Barium (Ba)
Phosphorus (P) 701 669 669
Zinc (Zn) 787 827 796
Molybdenum (Mo) 61 58 119
Boron (B) 15
Physical Tests
Viscosity (cSt 100C) 10.0 10.9 10.9
Physical / Chemical
Base Number (mgKOH/g) 4.2 3.5 4.0
Here is what the lab said:
All wear rates normal. Abrasive and other contaminant
levels are acceptable. Viscosity within specified
operating range.
Action: Resample next service interval to further
monitor.
This is ALS labs in Portland, OR. All things look good continuing to trend down even though I reported that the oil filter had multiple tears. This tells me that even though tears are not a good thing that their effects might be not that great or even minimal. The OLM at 12% shows the oil still has life with good TBN retention even though this truck sees short trips all the time.