Automatic gearbox cars have D3 mode, which is excellent for driving down hilly terrain, in stop-and-go situations, as well as driving on slick roads. Selecting D3 with the shift lever of an automatic car limits the transmission to only using the first three gears. This provides greater control of which gears your car uses, rather than letting the computer choose the gear.
Using D3 can be beneficial under certain driving conditions, such as:
1. Selecting D3 uses engine braking for driving down steep hills. This can reduce wear on brakes and brake pads.
2. Selecting D3 in stop-and-go traffic will prevent the car from shifting into higher gears, which will consume less fuel.
3. D3 is recommended when towing a trailer on hilly roads.You can check the owner’s manual for specific instructions on when to use D3 for your specific model. Some car models have only a D3 selection available on their shift lever.
In many modern cars, they rely on computers to determine the optimal gear. In “D” mode, the car may even shift into higher gears to warm up the engine faster in cold weather.
When “D3” is selected, the car will automatically shift between the first three gears, but will not shift to a higher gear.
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