Issue link: http://read.dmtmag.com/i/859318
Engine Oils Background & Properties castrol.com/GPS 800 255 4417 May 2025 GPS Industry Specifications Caterpillar 1N ASTM D6750 Scope: e 1N test is run in the Caterpillar 1Y5400 SCOTE (Single Cylinder Oil Test Engine) utilizing a one-piece aluminum piston and 0.05 wt. percent sulfur fuel. is test was originally developed to replace the 1K test as part of the upgrade requirements to move from API CF- 4 to API CG-4. e Caterpillar 1N uses the exact same hardware and test conditions as the 1K, but with low sulfur diesel fuel. It was added to API CI-4 Plus as an adjunct to the Caterpillar 1R test to insure that oils developed for this new category also protect engines that use one-piece aluminum pistons. e Caterpillar 1N is designed to determine the ability of an oil to provide minimal piston deposits; ring sticking; low oil consumption; and piston, ring and liner scuffing resistance. e test is intended to simulate on-highway, heavy-duty diesel service prior to 1998 with low sulfur fuel. Test Conditions: Engine speed: 2100 rpm Fuel flow rate: 8000 BTU/min Test length: 252 hours Approximate power output: 70 HP API CK-4 Pass/Fail Criteria: Top Groove Fill: 20% max Top Land Heavy Carbon: 3% max Weighted Demerits, max: 286.2 Avg. Oil Consumption, g/MJ (0-252h): 0.15 Piston Ring Sticking: none Ring/Liner Scuffing: none Caterpillar Oil Aeration Test (COAT) ASTM D8047 Scope: e COAT utilizes a Caterpillar C-13 6-cylinder engine to measure entrained gas or foam. A micro-motion meter measures oil density to calculate % aeration. Air is entrained in the lubricant during the test and reaches a maximum value toward the end of the test. Test Conditions: Fuel flow rate: 1.5 L/min Test length: 50 hours API CK-4 Pass/Fail Criteria: 11.5% max amount of air in oil in last 10 hours of the test A5 ecastrof