To be certain, you'll need to:
1. Consult your owner's manual: This is the best source for specific information about your vehicle. The manual will have diagrams and may even show the PCV valve's location.
2. Use a repair manual: A Haynes or Chilton repair manual (available online or at auto parts stores) will contain detailed diagrams and instructions for your specific engine.
3. Look online for diagrams: Search for "2000 Lincoln LS V6 engine diagram" or "2000 Lincoln LS V6 PCV valve location" to find images of the engine bay that might show the valve's location.
Remember to be cautious when working around hot engine components. Allow the engine to cool completely before attempting to locate or replace the PCV valve.