Which gear should be used for driving through water with an automatic transmission?

[LunaLynn]

For shallow water, the D gear is sufficient, while deeper water requires the L gear. Below is an introduction to automatic transmissions: 1. Automatic principle: The engine's power is transmitted through the gearbox, which is also a key factor affecting fuel consumption. Generally, automatic transmissions consume 10% more fuel than manual transmissions. Whether manual or automatic, more gears mean better fuel efficiency. 2. Driving tips: For manual transmission cars, shifting should be done at higher RPMs. Engines are designed to operate at higher RPMs, with components balanced and inertia parameters optimized for high-speed operation. Prolonged operation at non-optimal RPMs increases internal component load and wear, leading to frequent vibrations and knocking, which can reduce engine lifespan. Shifting at 3000 RPM ensures post-shift RPMs remain around 2300, keeping the engine within a healthy operating range.