* Model Year and Transmission Type: Different C5 models have different automatic transmissions, and each has its own service schedule.
* Driving Habits: Aggressive driving, towing, or frequent stop-and-go traffic can shorten the life of your transmission fluid.
* Fluid Condition: The best indicator is the condition of the fluid itself. It should be clear, not dark or burnt smelling.
Here's what I recommend:
1. Consult Your Owner's Manual: The most accurate information about your specific C5 model is in the owner's manual. Look for the recommended service intervals for the transmission fluid.
2. Check with a Certified Mechanic: Take your C5 to a reputable mechanic, preferably one specializing in Citroen vehicles. They can inspect the fluid and advise you based on your vehicle's condition and driving habits.
3. Don't Neglect Routine Maintenance: While the exact schedule might vary, it's generally good practice to have your automatic transmission fluid checked and potentially changed every 60,000 miles or 5 years.
Important Note: Changing automatic transmission fluid is not a simple DIY task. It involves specialized equipment and procedures to ensure proper filling and prevent air bubbles.