The higher viscosity index helps the oil resist thermal breakdown, maintaining its chemical integrity longer than thinner alternatives. For high-mileage engines, the thicker consistency can help rejuvenate slightly worn components by filling minor tolerances, reducing oil consumption and the visible signs of aging such as minor external leakage.
SAE 15W-40 Synthetic Blend Value and Performance Benefits
Selection Guidelines and Maintenance Tips Choosing the correct oil involves more than just matching the viscosity on the dipstick. Performance Characteristics and Temperature Range Manufacturers formulate SAE 15w 40 to meet specific performance standards, balancing energy efficiency with durability.
Always consult the vehicle’s owner manual to confirm that the manufacturer approves the use of SAE 15w 40 for that specific model year and application. The "40" refers to the oil's viscosity at 100°C, measuring its resistance to shear forces at normal operating temperature, ensuring the film strength remains adequate to protect moving parts.
SAE 15W-40 Synthetic Blend Value and Performance Benefits
Using the wrong viscosity can lead to inadequate lubrication or, conversely, reduced fuel efficiency. The robust formulation of this oil helps to manage the byproducts of diesel combustion, including soot and acids, extending the life of both the engine and the after-treatment systems like DPFs and DOCs.
More About Sae 15w 40 engine oil
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