Eni i-Sigma performance E3 20W-50

Worth knowing

API has declared the CG-4 class obsolete and explicitly allows CH-4, CI-4 and CJ-4 oils in its place; what the class used to demand of a diesel oil is described in the article on the API CG-4 class. The line has a second 20W-50, Eni i-Sigma performance CI HBN 20W-50, with API CI-4 and ACEA E3 among its classes but without MB 228.1 and MTU Oil Category 2. No other Eni 20W-50 in the catalogue lists MTU Oil Category 2 at all; here that code, like MB 228.1, has the status “meets”.

In the code list, all that separates this oil from E3 15W-40 is MAN M 3275-1, which it does not have; its kinematic viscosity at 100 °C is 18.5 mm²/s, against 14.4 mm²/s for the 15W-40. This oil’s data sheet gives cold cranking at -15 °C, 9,000 mPa·s, and the E3 15W-40 sheet at -20 °C, 6,500 mPa·s. SAE J300 sets the temperature for this test separately for each W grade, so the two figures are not directly comparable.