It took about 10-15 minutes to use 8 liters of oil. It says not to work more than 30 minutes, I chose to take a break at the 10 minute mark just to be on the safe side, that was my choice too. I'm very happy with it, it's cheap, the suction power is big and sufficient, and it saved me energy and time compared to manual oil suction. If it breaks after 2-3 uses I'm still happy with it and happy to buy another one if you have a boat. I'm sure you'll get what I'm talking about lol. Ps, I warmed up the engine before use.
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