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.
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.
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) <1 <1 <1 Copper (Cu) 181 109 93 Tin (Sn) <1 <1 <1 Aluminium (Al) 6 6 7 Nickel (Ni) <1 <1 <1 Silver (Ag) <1 <1 <1 Titanium (Ti) <1 <1 <1 Vanadium (V) <1 <1 <1 Contaminants (ppm) Silicon (Si) 25 14 7 Sodium (Na) 5 4 <1 Potassium (K) <5 <5 6 Water (%) 0.20 <0.05 <0.05 Coolant No No No Additives (ppm) Magnesium (Mg) 9 7 14 Calcium (Ca) 2260 2450 2360 Barium (Ba) <1 <1 <1 Phosphorus (P) 701 669 669 Zinc (Zn) 787 827 796 Molybdenum (Mo) 61 58 119 Boron (B) 15 <5 8 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.
