The numbers on an engine oil label tell you how the oil flows at different temperatures. Understanding them helps you pick the right product — but always start with your owner’s manual.
Reading the grade
In a grade like 5W-30, the first number with “W” (winter) describes cold flow — lower means faster flow at start-up. The second number describes thickness at normal operating temperature.
SAE 20W-50
A heavier multigrade that holds a strong film at high temperatures. Popular for older and high-mileage petrol engines and hot-climate driving.
SAE 5W-30
A versatile modern grade specified for many of today’s petrol cars and SUVs, balancing start-up protection with high-temperature performance.
SAE 0W-20
An ultra-low viscosity grade for the latest fuel-efficient engines and hybrids.
What about API?
The API “S” categories (SL, SN, SP…) describe petrol engine performance standards. Newer letters indicate newer standards — API SP is currently the latest.
| Grade | Amani Lube product | Typical use |
|---|---|---|
| 20W-50 | Motor Engine Oil · API SL | Older / high-mileage engines |
| 5W-30 | Engine Oil · API SN | Modern petrol cars & SUVs |
| 0W-20 | Engine Oil · API SP | Latest engines & hybrids |