CI-4 15W/40 Diesel Engine Oil High-Temperature Protection
The "40" in 15W/40 represents the high-temperature viscosity grade. According to SAE standards, the oil maintains an appropriate viscosity at 100°C. This stable viscosity allows the oil to form a strong oil film at high temperatures, tightly adhering to the surfaces of high-speed moving components such as the engine piston and crankshaft. This effectively isolates metal friction and reduces the risk of wear.
The addition of a high-efficiency antioxidant protects against oxidation reactions caused by high temperatures. When diesel engines operate at high temperatures, engine oil is susceptible to oxidation upon contact with air. Antioxidants slow this oxidation process, preventing oil thickening, sludge formation, and varnish formation, ensuring smooth oil passages and maintaining efficient engine operation.
The dispersant is a key component of this oil. It disperses impurities such as soot and carbon deposits produced by combustion into fine particles, suspending them in the oil to prevent them from settling inside the engine. This reduces abnormal wear caused by impurities and keeps the engine clean.
Under harsh operating conditions of high temperature and high load, engine oil is subjected to intense shear forces. CI-4 15W/40 exhibits excellent shear resistance, making its molecular structure resistant to damage. Even under high-shear conditions such as frequent acceleration and hill climbing, it maintains oil film strength and provides continuous, reliable engine protection.
Extensive practical applications and professional testing have proven that diesel engines equipped with CI-4 15W/40 experience significantly reduced wear on key components during extended operation in high-temperature environments, effectively extending engine overhaul intervals and ensuring stable operation and service life in high-temperature environments.
