Oil Viscosity - Navistar MaxxForce 7 Operation And Maintenance Manual

SECTION 2 – REQUIREMENTS FOR FUEL, ENGINE OIL, AND COOLANT
Engine Oil (cont.)
API CJ-4 FOR HIGH PERFORMANCE DIESEL ENGINES
(cont.)
NOTE: Mineral and synthetic oils are acceptable for use
provided they meet the API category recommendations and
ambient temperature guidelines. Always follow recommended
oil change guidelines no matter what oil is used.
API CJ-4 oils provide protection against the following:
• Catalyst poisoning and particulate blockage
• Engine wear
• Piston deposits
• Soot related viscosity increase, deposits, and wear
• Viscosity loss due to shear
• Oxidative thickening
• Oil foaming and aeration
API CJ-4 oil, in combination with Ultra Low Sulfur Diesel (ULSD)
fuel (0.0015% [15 ppm] maximum sulfur content), is required to
maintain performance and durability of aftertreatment systems
meeting 2007 and beyond diesel emission regulations.
API CI-4 oils are allowed in diesel engines that meet these
regulations. Use of the CI-4 engine oil shortens Diesel
Particulate Filter (DPF) cleaning service intervals.
Page 36

OIL VISCOSITY

Figure 11 SAE Viscosity Grades And Temperature Ranges
The Society of Automotive Engineers (SAE) defines oil viscosity
(thickness) by grade. Colder temperatures require lower grade