Here's why and how to find the information:
* Different Engines, Different Needs: The 1999 Eldorado came with a few different engine options (like a 4.6L Northstar V8 or a 3.8L V6). Each engine has specific oil viscosity and type recommendations.
* Your Owner's Manual is Key: The best source of information is your car's owner's manual. It will clearly specify the correct oil type (conventional, synthetic, etc.) and viscosity (like 5W-30 or 10W-40) for your engine.
* Check Your Oil Fill Cap: Sometimes the oil type and viscosity are listed on the oil fill cap.
* Consult a Mechanic or Dealership: If you can't find the information in your manual or on the oil cap, a local mechanic or Cadillac dealership can help you determine the correct oil for your car.
Remember: Using the wrong type of oil can harm your engine, so it's crucial to use the recommended oil.
