Why would my kia leak oily stuff in my passanger floorboard?

If your Kia is leaking oily substance in the passenger floorboard, it could be due to a few potential issues. One common cause is a malfunctioning heater core, which can leak coolant into the cabin. Another possibility is a damaged gasket or seal, allowing engine oil or Transmission Fluid to seep inside. It's important to inspect the source of the leak promptly to prevent further damage or safety hazards.