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The 2004 Jaguar XJ8 uses Valvoline MaxLife Full Synthetic transmission fluid. It's recommended to change the fluid every 30,000 to 60,000 miles to avoid potential issues. When the transmission fluid gets old, it can produce unpleasant noises. If the torque converter wears out, you might encounter trouble. The transmission is a critical component of the car, and problems are bound to occur eventually. Symptoms like stuck gears, jerking, harsh shifts, shuddering, delayed shifting, and slipping can arise. If there's a transmission fluid leak, it should be fixed promptly.
The type of transmission fluid needed for the 2004 Jaguar XJ8 is Valvoline MaxLife synthetic transmission fluid.
I switched to using Dextron 6 instead of mineral oil for my XJ 8, and it's still going strong with 214,053 miles on it now.
I've owned a total of 5 Jaguars, with my most recent being a 2004 XJ8 that has accumulated 274,000 miles. The original engine and transmission are still in great shape. I rely on Castrol 0-40 full synthetic oil and Castrol Transmax transmission fluid.