40:1 means 25 mL of quality 2‑stroke oil per 1 L of unleaded petrol—simple enough to do without a calculator, but here’s a cheat sheet.
| Fuel | Oil @ 40:1 |
| 1 L | 25 mL |
| 2 L | 50 mL |
| 5 L | 125 mL |
| 10 L | 250 mL |
Pour the oil into the jerry first, add fuel, cap, and give it a gentle shake—like a polite milkshake, not a maraca solo.
If your engine or oil brand specifies another ratio (some want 50:1), obey that instead; too lean risks seizure, too rich makes smoke and fouls plugs.
Use fresh fuel and a proper 2‑stroke oil—your whipper snipper will thank you.
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