If i have 4.5 liters of gas how much oil do i add?

The amount of oil you should add to 4.5 liters of gas depends on the specific oil-to-gas ratio recommended for your engine. Common ratiOS for two-stroke engines are 50:1 or 40:1. For a 50:1 ratio, you would add 90 mL of oil, while for a 40:1 ratio, you would add 112.5 mL of oil. Always refer to your engine's manual for the correct ratio.