The car leaked oil. I changed an oil pump and stopped it all night, but still a few drops of oil leaked out. I called the mechanic and he said that the soil underneath was very hot.

First of all, it is necessary to find out where the oil drips and how much it can drip in one night. You can check these yourself. One or two drops a night is not a big problem, and you have to go to the repair shop to make it up. Because replacing the oil pump means removing the cylinder block, both the cylinder block and the oil pump have buffer pads, which will drip oil if it is not handled well, and the oil filter will also be removed, and oil will leak if it is not installed well. If there is oil leakage in these places, they will have to reinstall it for you.