Issue link: http://read.dmtmag.com/i/859318
Engine Oils Background & Properties castrol.com/GPS 800 255 4417 May 2025 GPS Industry Specifications Cummins ISM ASTM D7468 Scope: Cummins ISM is a replacement for Cummins M-11 EGR. It is used to evaluate a lubricant's effectiveness at reducing soot-related wear of overhead components, sludge and oil filter plugging. High-load, heavy-duty field conditions with high soot and EGR flow rates using a 2004 emission-compliant engine are simulated. Test Conditions: is 200-hour procedure uses a Cummins ISM engine equipped with EGR and is intended as a replacement procedure for the M-11 EGR, using newer hardware. e Cummins ISM procedure uses ultra low sulfur diesel fuel. API CK-4 Pass/Fail Criteria: Top ring mass loss, mg, max: 100 Delta oil consumption, g/h: 31 Top land carbon, avg, percent: 35 Top groove carbon, avg, %: 53 Second ring top carbon, %: 33 Total Merits: 1000 Cummins ISB ASTM D7484 Scope: e Cummins ISB test method is a 350-hour test developed to evaluate the durability and reliability of the camsha and tappet interface when run with different lubricating oils. Oil performance is determined by assessing crosshead wear, tappet weight loss, and cam profile wear at 3.25% soot. Test Conditions: e test method uses a 2007 EPA emission compliant Cummins 5.9L ISB diesel engine. Test duration is 350 hours in two stages. During the 100-hour stage A, the engine is operated with retarded fuel injection timing to generate excess soot. During the 250-hour stage B, the engine is operated at cyclic conditions to induce valve train wear. API CK-4 Pass/Fail Criteria: Average cam wear, microns: 55 max Average tappet wear, mg: 100 max GM 6.5 Roller Follower Wear Test (RFWT) ASTM D5966 Scope: e RFWT or GM 6.5L measures an oil's ability to prevent wear of the pin in an engine equipped with needle bearings in the roller cam followers. Test Conditions: Engine speed: 1000 rpm Fuel flow rate: 9.0 kg/hour A7 ecastrof