2001 Chevrolet Tahoe 5.3L V-8 stock engine. 6 quart sump capacity. Schaeffer's #701 5W-30 synthetic blend API SN. NAPA Gold oil filter. Airaid open element NON-oiled air filter. Mix of highway and short trip driving during fall/winter months. 5,131 miles on oil, 105,282 miles on engine. Oil was changed at the signal of the oil life monitor, and saw service of about 4 months. This is the second run of Schaeffer's in this vehicle, and the first oil analysis performed. 6 ounces of Neutra #131 was used in the previous fill to purge the crankcase and run over 500 miles before changeout. Blackstone performed the test. 4FEB2012 Aluminum-2 Chromium-1 Iron-24 Copper-6 Lead-5 Tin-3 Moly-338 Nickel-1 Potassium-1 Boron-10 Silicon-17 Sodium-291 Calcium-1907 Magnesium-23 Phosphorus-845 Zinc-877 SUS [email protected] cST [email protected] Flashpoint F-405 Fuel-<0.5 Antifreeze-0 Water-0 Insolubles-0.3 TBN-1.6 Viscosity is definitely low, and Blackstone attributes this to shearing. I don't know how this family of engines behaves, whether oil shearing is common. There is some piston slap on cold start-up, but not as noticeable as some engines I've heard. I do have a virgin sample of the current fill of this same oil sent in for analysis to see what those numbers are. The cost of this oil was $5.65 a quart full retail.