Issue link: http://read.dmtmag.com/i/859318
Engine Oils Background & Properties castrol.com/GPS 800 255 4417 May 2025 GPS Industry Specifications Mack T-11 ASTM D7156 Scope: e Mack T-11 procedure evaluates soot handling performance, as measured by viscosity increase, of lubricating oils operating in diesel engines equipped with cooled exhaust gas recirculation. e evaluation simulates stop-and-go operation and high-soot loading. It is run on a Mack E-TECH V-MAC III engine. Test Conditions: Oil samples are taken every 12 hours and analyzed for soot content and viscosity. Test duration is 180 hours. API CK-4 Pass/Fail Criteria: e main parameter is the kinematic viscosity increase limit within soot "windows": 3.5% minimum soot for 4 cSt viscosity increase 6.0% minimum soot for 12 cSt viscosity increase 6.7% minimum soot for 15 cSt viscosity increase Mack T-12 ASTM D7422 Scope: e Mack T-12 test involves the use of a Mack E-TECH V-MAC III diesel engine with Exhaust Gas Recirculation (EGR). is test method was developed to evaluate the wear performance of engine oils in turbocharged and intercooled four-cycle diesel engines equipped with EGR and running on ultra-low sulfur diesel fuel (ULSD). Test Conditions: A warm-up and a 1-hour break-in are followed by a two phase test consisting of 100 hours at 1800 r/min and 200 hours at 1200 r/min, both at constant speed and load conditions. API CK-4 Pass/Fail Criteria: Top ring mass loss, mg, max: 105 Cylinder line wear, µm, max: 24 Volvo T-13 ASTM D8048 Scope: Volvo T13 uses a 2010 Volvo/Volvo D13 6-cylinder diesel engine with electronically controlled fuel injection, six electronic unit injectors, VGT (variable geometry turbocharger), and cooled EGR (exhaust gas recirculation). e test measures Kinematic viscosity increase at 40°C (300-360 hours), % max. Oil filter adapter is a modified 2007 housing. Test Conditions: e 360-hour test is conducted at 1500 RPM steady state conditions at a given fuel flow to evaluate the oxidation stability performance of engine oils at an elevated oil temperature. ULSD fuel is used. API CK-4 Pass/Fail Criteria: IR Peak at EOT, abs, cm -1 , max: 125 Kinematic viscosity increase at 40 °C, %, max: 75 A6 ecastrof