PETRO FLEXIA 15W-40 (CI-4)

Premium Heavy-Duty Engine Oil for Extreme Temperatures and Demanding Conditions

PETRO FLEXIA 15W-40 (CI-4) is a premium-grade, high-performance diesel engine oil engineered for heavy-duty applications. Formulated with advanced viscosity index improvers, this oil delivers exceptional stability across extreme temperature ranges—ensuring reliable lubrication whether operating in scorching heat or freezing cold. It meets the stringent API CH-4/SJ and API CI-4/SJ standards, making it suitable for modern diesel engines that demand superior protection under demanding conditions. The SAE 15W-40 viscosity grade ensures optimal flow at startup while maintaining sufficient thickness to protect engine components during operation.

This diesel engine oil offers outstanding performance through its balanced blend of detergents, dispersants, anti-wear additives, and oxidation inhibitors. Its high Total Base Number (TBN) of 9–11 mg KOH/g provides excellent neutralization capacity against acidic byproducts formed during combustion, extending oil life and reducing sludge and deposit formation. With a flash point exceeding 200°C and a pour point below -23°C, PETRO FLEXIA maintains fluidity and safety even in harsh environments. The oil’s color classification (ASTM L2) indicates a clean, stable formulation free from impurities, ensuring consistent performance over time.

Ideal for long-haul trucks, construction equipment, agricultural machinery, and other heavy-duty diesel-powered vehicles, PETRO FLEXIA 15W-40 delivers unmatched protection against wear, corrosion, and thermal breakdown. It is specially designed to safeguard engines running on low-sulfur or ultra-low-sulfur diesel fuels, including those with biodiesel blends. The product has undergone rigorous unit testing, confirming compliance with all physical properties such as kinematic viscosity at 40°C (115–129 cST), viscosity index (minimum 125), and thermal stability. These tests validate its ability to maintain performance under prolonged use, reduce maintenance frequency, and enhance engine longevity—making it a trusted choice for commercial fleets and industrial operations worldwide.