This is exactly my experience here and we live in hot desert climate on the highway doing 145kmh/90mph transmission temperatures is around 92C range and highest I've seem during sand driving in hi range is 115C with outside temperatures around 40C.Here is what I found so far for our 8 speed trannys:
For the 2024-2025 Toyota Land Cruiser 250 (LC250) with the 8-speed automatic transmission, typical transmission fluid temperatures under various conditions are as follows:
Normal highway driving:
- ~150-180°F (65-82°C)
- ~180-210°F (82-99°C)
- Temperatures can rise to 220-240°F (104-116°C), especially if you remain in higher gears without the torque multiplication and cooling benefits of low range.
- Above 250°F (121°C) risks fluid degradation and potential overheating warnings or limp mode engagement.
- Toyota generally considers 260°F (127°C) critical for their recent 8-speed units.
During highway high speed test I've done doing the maximum speed 180kmh 'GPS speed 172kmh' , while outside indicated temperatures was 48C the transmission temperatures reached 102C .
Car is 2.8 diesel variant.
