I bought a used car, which is all good. I tried to switch gear from D to L (L is the only low gear it has) before climbing a fairly steep road, but the car made kind of rumbling noise, which didn’t sound nice or normal I think.
Another time it didn’t do this noise.
Can you tell me why this happened? Perhaps I switched to the lower gear in the wrong time?
To switch to lower gear I keep the same speed (don’t slow down or anything) and just switch gear. If the car has already enough speed to climb a hill I don’t switch gear.