UOA by Oil Analyzers Log Wheel Loader 3126 turbocharged inline 6 cylinder 6000 hours on engine 286 Hours of Oil Amsoil PCO Blend 15w-40 Oil and filter not changed. Iron-19 Chromium-0 Nickel-0 Aluminum-1 Copper-0 Lead-0 Tin-0 Cadmium-0 Silver-0 Vanadium-o Silicon-1 Sodium-3 Potassium-0 Titanium-0 Moly-4 Antimony-0 Manganese-0 Lithium-0 Boron-8 Magnesium-40 Calcium-3263 Barium-2 Phosphorous-1083 Zinc-1277 Fuel-<1% Soot-0.8% Water-.1% Vis 100 CS 13.7 TBN 10.80 Oxidation-11 Nitration-11 We were using Mobil Delvac Super 1300 MX which is a CIplus rated oil. This engine and egr setup would shear that oil badly. Max drains were about 300 hours. I will post a UOA on this oil soon to compare and contrast. I am very happy with the Amsoil PCO in this log loader. I will run at least to 400 hours and possibly more. This lift is run very hard for 10 hours a day unloading log trucks and sorting logs to be sawed. My goal was to find a longer drain oil that would hold up to the higher temperatures that this engine produces. I think mission accomplished. My operations manager wants to stick to a 250 hour OCI. He will probably not like me to extend these intervals, but it sure will free the maintenance crew up to do other projects other than oil changes.