I have a 2009 Nissan Pathfinder 93000 km. the 3/8 transmission cooler return line broke and I lost my transmission fluid. It was replaced and 6 liters of Valvoline Maxlife Dexron 111 Automatic Transmission fluid added. All worked fine for a day. Then the transmission started to slip around 40 MPH. Wondering if this is a result of the transmission fluid used or has the transmission been damaged.
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