HK1837 wrote:Not surprised you cooked the fluid on sand if you don't have an auxiliary cooler. Any towing or sand 4x4 work (especially 4x4H) on an A750F transmission without an aux cooler will probably see you cooking fluid. I'd talk to Wholesale Autos about one of their cooler kits whilst you are there too!
I've had a Wholesale Auto cooler on my 2011 with A750F auto since around 1000kM on the clock. I put a trans temp gauge on it prior to fitting the cooler, and even towing an empty box trailer the fluid exceeded 120deg after less than 10min driving in 25deg ambient. After fitting the cooler I can tow a car trailer with a Monaro or Holden van on it in stinking hot weather up hilly roads for hours on end and temp stays below 100deg. Though even with the cooler on towing 2000kg in 5th up a big hill OR on the beach in 4x4 high will see it get to 120deg and want to go higher. So 'd hate to see how hot one of these would be getting without a cooler. Having the dash light come on means it is well into fluid killing territory, probably up to 150deg or more as the fluid exits the torque converter. If I remember correctly the dash light is driven off a temperature sensor prior to the torque converter, and most of the heat comes from the torque converter.
Valvoline Maxlife is a superior fluid to Toyota WS, just about any of the full synthetics probably are. Wholesale Autos will tell you basically the same thing. I changed mine to Maxlife recently, full machine flush. The WS was at end of life, it had started to go away from red into brown by 110,000kM, but I was always careful to keep it below 120deg.
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