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How much transmission fluid for 6.6L diesel?

There's no single answer to how much transmission fluid a 6.6L diesel engine needs. The amount depends entirely on the specific vehicle and transmission type. A 6.6L Duramax diesel engine, for example, might be paired with several different transmissions (Allison 1000, etc.), each with a different capacity.

To find the correct amount, you must consult your vehicle's owner's manual. This manual will specify the exact capacity for your transmission. Using the wrong amount can severely damage your transmission.