with the additive.
The Mixed Oil is obtained after mixing the Machine Oil with the Oil Additive. This is the one of the three necessary items needed for activation of the cable car. Checking the tool panel of the tram, that has no oil, one can read the message: "The Mixed Oil has been used up.".
After using the oil at the tram's panel bar, the indicator of oil level becomes green and the item disappears from the inventory.