Viscosity is a measure of an oil's resistance to flow. The Society of Automotive Engineers (SAE) developed a numerical code system for grading motor oils according to their viscosity.
In a multi-grade oil like 5W-30, the first number (5W) indicates the oil's flow characteristics in cold temperatures — the W stands for Winter. The lower this number, the better the oil flows in cold weather. The second number (30) indicates the oil's viscosity at operating temperature (100 degrees Celsius).
Here is a breakdown of common grades: - 0W-20: Ultra-thin, excellent cold flow, ideal for modern fuel-efficient engines - 5W-30: Most popular grade worldwide, great all-season performance - 10W-40: Slightly thicker at operating temperature, good for older engines - 15W-40: Common in diesel engines, robust protection under heavy loads - 20W-50: Thick oil for high-temperature or high-mileage applications
Choosing the correct viscosity grade is crucial. Always consult your owner's manual or contact our technical team at i-GlooOil for guidance. Using the wrong viscosity can lead to increased wear, reduced fuel economy, and potential engine damage.
