Hello all, I wanted to post my recent Black stone labs UOA on my rig with this Mobil delvac extreme 10w30 syn blend (CK4) 167,000 miles on motor. 10,600 miles on oil with 1.5 quarts added. Ac Delco oil filter S and B dry air filter SUS viscosity @210f 65.7 CST viscosity 11.79 Flashpoint 420 Trace of fuel noted, no TBN test. Aluminum 4 Chromium 1 Iron 18 Copper 2 Lead 0 Tin 1 Molybdenum 54 Nickel 0 Manganese 0 Silver 0 Titanium 0 Potassium 3 Boron 59 Silicon 9 Sodium 4 Calcium 1831 Magnesium 631 Phosphorus 1440 Zinc 1464 Barium 0 I had bought this oil on clearance, and haven't done a UOA in a few years. I had refilled with delvac 1300 15/40 also bought on clearance. The delvac 1300 refill is the CK/4 SN rated oil which I hear some people fret about the limit on zinc.. but I don't believe it should cause me any concern. Have a great day folks.