1. Loose Drain Plug:
* The simplest fix: The most common cause is a loose drain plug. This is easily checked and corrected.
* How to fix it: Jack up the car, support it securely with jack stands (safety first!), locate the drain plug, and tighten it with the correct size wrench. Don't overtighten; you could strip the threads.
2. Damaged Drain Plug:
* A slightly more complex fix: The drain plug might be damaged or worn, preventing a proper seal. This can happen from overtightening or impact.
* How to fix it: Replace the drain plug with a new one. Make sure to get the correct size and type. Auto parts stores will have them, often listing them by year, make, and model.
3. Damaged Drain Plug Threads:
* More challenging fix: The threads in the oil pan itself might be damaged, preventing a tight seal even with a new drain plug.
* How to fix it: This requires more work. You might be able to carefully chase the threads (clean them up with a tap and die set) if the damage is minor. For significant damage, the oil pan may need to be replaced or repaired by a professional. This is the most expensive option.
4. Cracked or Damaged Oil Pan:
* Most serious fix: A crack or damage in the oil pan itself, near the drain plug, will cause a leak.
* How to fix it: Minor cracks *might* be repairable with a sealant designed for oil pans, but this is often a temporary fix. A more significant crack typically requires replacing the oil pan. This job is best left to a mechanic, unless you're comfortable with significant auto repair.
Before You Start:
* Safety First: Always use jack stands when working under a car. Never rely solely on a jack. Wear safety glasses.
* Gather Supplies: You'll need a wrench (the correct size for your drain plug), a new drain plug (if needed), rags or shop towels, and possibly a drain pan to catch any remaining oil.
* Check your owner's manual: Your manual will specify the correct type and size of drain plug.
Step-by-Step (for a loose or damaged plug):
1. Jack up the car and secure it with jack stands.
2. Locate the oil drain plug. It's usually on the bottom of the oil pan, at the front or slightly towards the back of the engine.
3. Clean the area around the drain plug. This will help you see what you're doing and prevent debris from getting into the oil pan.
4. Try tightening the existing plug. Use the correct size wrench, tightening only until snug. Don't overtighten.
5. If tightening doesn't work, replace the drain plug. Install the new plug by hand first, then tighten with the wrench. Again, avoid overtightening.
6. Lower the car and check for leaks. Run the engine briefly and then inspect the area for any oil leaks.
If tightening or replacing the plug doesn't solve the leak, you'll likely need to take your Impala to a mechanic for more advanced diagnosis and repair. Ignoring an oil leak can cause serious engine damage.
