While D3 restricts itself to the first three gears (1, 2, and 3), D4 is restricted to the first four gears (gears 1, 2, 3, and 4). While you're driving, D4 helps your vehicle automatically choose a gear that's appropriate for your current acceleration and speed.
Should I drive on D3 or D4?
D3 is suitable for ascending or descending hills and is the best gear position for stop-and-go situations. D4 is more suitable for all conditions and has a higher speed than D3. The D3 may not be suitable for highway driving, but the D4 is suitable for both town and highway driving.
What is D4 and D3 on a car?
Well, your transmission has four gears. The D3 is. to tell the car to "Drive forward, starting with first gear and going no. higher than third gear." The D4 is to tell the car to "Drive forward, starting with first gear and going all the wayyyyyy to fourth gear." There.
Is it OK to drive on D3?
You would only use D3 while going downhill with a load so you can use your brakes less. Your mileage would be worse since the engine is running at a higher rpm. Only if you did a lot of using D3 would it make any appreciable wear on your transmission. Save this answer.
When should I use D4 gear?
Drive (D4) — Use this position for your normal driving. The transmission automatically selects a suitable gear for your speed and acceleration. You may notice the transmission shifting up at higher speeds when the engine is cold. This helps the engine warm up faster.
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