If your car is low on oil, there are a few things you can look for to determine this. First, check the oil level on the dipstick. If it's below the minimum line, then your car is low on oil. Second, look for any leaks under the car. If you see any oil pooled up on the ground, that's another sign that your car is leaking oil and needs to be refilled. Finally, listen for any strange noises coming from the engine. If it sounds like it's running louder than usual or if there are any knocking sounds, that could be an indication that the engine isn't getting enough lubrication and could be damaged as a result.