Oil Viscosity Grades
Comprendere SAE Ratings
Impara Oil GradesMotor oil viscosity grades like 5W-30 tell you how il oil flows at different temperatures. Comprendere these ratings helps you choose il right oil per your engine e climate conditions.
Comuni Oil Grades
| Grade | Cold Start | Best For |
|---|---|---|
| 0W-20 | Excellent | Modern fuel-efficient engines |
| 5W-30 | Very good | Most passenger vehicles |
| 10W-40 | Good | Moderate climates, older engines |
| 15W-40 | Fair | Diesel engines, hot climates |
| 20W-50 | Poor | High-performance, racing |
Lower W numbers flow better in cold; higher secondo numbers maintain protection quando hot.
Conclusione
Always usare il viscosity grade recommended in your owner's manual. Modern engines often require thinner oils (0W-20, 5W-30) per fuel efficiency e tight tolerances. Thicker isn't always better—il wrong viscosity puo reduce fuel economy e cause wear.