The diesel engine using CE-grade oil lubrication under low speed, high load and high load condition, the turbo-charged diesel engine should choose CD grade and above; CF-4 is suitable for high speed, heavy load, long period running diesel engine, especially suitable for expressway driving. Effectively prevent piston ring wear, engine oil thickening, fuel sulfur content is less than 0.05%, select CG-4 diesel engine oil; fuel injection pressure is greater, the operation of the higher temperature of the double metal piston engine, the use of CH-4 diesel oil, the engine equipped with "Low-temperature exhaust gas recirculation" system, the requirements of CI-4 diesel oil.
The high grade and the low grade lubricating oil, in the antioxidant ability, the clean dispersing ability and so on all obviously enhances. In addition, in the valve mechanism wear protection, grease resistance, prevent filter blockage, lubricating oil loss and low temperature pump delivery has been significantly optimized.
At present, with the environmental protection requirements of the three countries, four of the promotion of the engine manufacturers to launch a high-quality engine (electronic control engine), the use of oil levels are also improving, CD-level has been eliminated, CF, CH-class become mainstream. According to China's national conditions, such as heavy vehicle overloading, poor road conditions, low level of professionalism of the driver, diesel sulfur content instability and other adverse factors, resulting in early overhaul of the engine. So we should choose the oil with high quality grade.