Some people worry that oil will enter the floor drain and cause ecosystem pollution. If you leak a lot of oil in your garage, it will be a normal problem. I think this is a rare situation. If you are concerned about oil contamination, you can install a commercial oil separator during drain installation. As for oil pollution from cars and trucks, imagine how many gallons of gasoline, engine, transmission, and hydraulic hoses drip onto your town or city road every day.
Common sense is also needed if the engine or transmission of your car or truck is fatigued. If a small amount of oil does leak out, then, in good faith, put some cardboard to absorb the leak and replace it when it saturates. There are also dry granular products to absorb oil spills.
It is important to make sure that the top of the floor drain is about 2 inches below the main level of the garage slab. Concrete contractors need to create large shallow funnels around the floor drain.
The size of the funnel depends on the size of the car or truck. The funnel should be at least 10 feet wide and 22 feet long. Center the floor drains so that they are parked in the garage, just below the center of the car or truck.
Another benefit of owning a garage floor drain is that you can wash your car or truck inside on hot or cold months. You can buy a special hose bib that has both a cold water handle and an indoor sink. This way you can rinse the vehicle with warm water.