The BMW i3 Transmission Oil Cooler maintains the transmission oil within the reduction gearbox at a constant temperature, making dynamic electric driving possible while also ensuring durability. This Transmission Oil Cooler features a compact design with hot fluid flowing through a plate style oil to water core that is plumbed directly into the coolant loop of the BMW. This gets the heat away from the gearbox quickly while also allowing the unit to warm up quickly. The installation of the BMW Transmission Oil Cooler takes place in close proximity to the drive unit, thus keeping the hose length short, pressure loss low, and efficiency high, especially during normal driving and on steep hills. Both the all-electric i3 and the range-extended i3 feature a Transmission Oil Cooler. This novel feature prevents the gearbox lubricant from thinning during peak torque or extreme ambient temperatures. The component's tried-and-true design mimics the high-stress solutions from the wider BMW family to ensure owners' confidence mile after mile. The Transmission Oil Cooler is a clever design that uses existing coolant pathways to avoid taking up packaging space in the tightly packaged rear axle zone, which is critical for the lightweight i3. No matter the model year, either early 60 Ah examples or later 120 Ah editions, each shares the same Transmission Oil Cooler layout, indicating parts compatibility and making service planning easier for all. Through the maintenance of ideal fluid viscosity, the Transmission Oil Cooler reduces parasitic drag, resulting in sharper acceleration and a modest increase in overall range. It also reduces the likelihood of thermal breakdowns that incur expensive repairs. This enhancement benefits all BMW i3 owners. Though the stainless plates of the component are corrosion-resistant, periodic changes of the coolant that occur regularly will keep the channels clear and the Transmission Oil Cooler help protect the i3 drive system at high load or stop-and-go driving situations.
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