機油黏度標準 vs 黏度的意義
SAE VISCOSITY GRADES FOR ENGINE OILS （SAE J300 DEC . 99）
| High ShearViscosity(cP)at 150℃ and 105 S-1 Min | |||||
| SAE | viscosity（cP）at Temperature（℃） | Viscosity（cSt） | |||
| Viscosity | Max | at 100℃ | |||
| Grade | Cranking | Pumpability | Min | Max | |
| 0W | 6200 at -35 | 60 000 at -40 | 3.8 | — | — |
| 5W | 6600 at - 30 | 60 000 at -35 | 3.8 | — | — |
| 10W | 7000 at - 25 | 60 000 at -30 | 4.1 | — | — |
| 15W | 7000 at - 20 | 60 000 at -25 | 5.6 | — | — |
| 20W | 9500 at - 15 | 60 000 at -20 | 5.6 | — | — |
| 25W | 13000 at - 10 | 60 000 at -15 | 9.3 | — | — |
| 20 | — | — | 5.6 | Less than 9.3 | 2.6 |
| 30 | — | — | 9.3 | Less than 12.5 | 2.9 |
| 40 | — | — | 12.5 | Less than 16.3 | 2.9 |
| 40 | — | — | 12.5 | Less than 16.3 | 3.7 |
| 50 | — | — | 16.3 | Less than 21.9 | 3.7 |
| 60 | — | — | 21.9 | Less than 26.1 | 3.7 |
例 : 10W-60 . 0W-50
1.機油的黏度與號數成正比，號數越小表示機油越稀，號數大則越濃 !
2.機油黏度前的" w "為winter冬季的意思，代表低溫黏度值，用以判斷低溫啟動時的難易 !
以台灣氣候而言…低溫黏度10w.15w已足夠保證引擎推動順利，但隨著新一代的汽車引擎問世，更精密的機械間隙和微小管路之設計，5w 和 0w 更能讓您的新車瞬間潤滑 !
3. 黏度標示後的數字為高溫環境下的油膜韌度，一般在最通用的則是 40或 50 的級數 !
4. 從低溫到高溫的黏度範圍越大，代表適用的溫度範圍越大!
