that means I just press the OD button regardless normal driving or down hill la for fuel efficiency?

sorry my literature
I don't have a lot of mechanic knowledge when it comes to cars

Have you tried L gear all the way when downslope?
I tried change from D to L the sound change I'm afraid the gear box will break if I keep changing from D to L along the slopes

Your gearbox is tougher than you think. It would not break that easily unless you push it to the limits (redlining all the way)

D is normal drive, computer shift gear according to speed. Higher speed = higher gear. You don't want that going down hill. Downhill must have engine braking using low gear, some AT car can go down to 1, but nowadays probably only down to 2 only.

Up slope with D, computer sense not enough torque then will auto drop gear to give torque / acceleration so revs go up.

All normal unless for whatever reason you drive until red line

The O/D Off switch will prevent the gear from going into 5th gear. If cruising on highway, this of course will be more fuel consumption.

What car are you driving? Not all cars have this O/D Off switch. Do read my previous post again, as it tells the different btw L (or L1 and L2) and this O/D Off switch.

If talking about Getting Highlands, normally I will switch to L at the top and switch back to D at the polis pondok. If driving Xtrail 2.5, using the O/D Off switch is good enough, as its bigger engine (than say a 1.5 car) is giving higher engine braking.

If talking about Cameron Highlands, just D will do.

Uphill also use 2 right? I felt like whenever the road is too steep I will change from D to 2 immediately

Uphill not necessary since computer will do the gearing work. But if you insist as it feels to give you more power then also no harm

So, meaning, going downhill with steeper slope, AT car needs to shift to lower gear eg. 2 or 1, right?

Recently, I experience AT car going downhill at Cameron Highland with D Gear, the RPM shot up and car like want to rush forward (lost control)...

I think many people are unfamiliar or scared of engine braking because of the high RPM and loud engine noise...

That is actually fine because it's doing exactly what it's supposed to do

Just go youtube search for engine braking for further explanation

Very dangerous with D while downsloping at genting
It's even wtf case if during holiday everybody stuck at downslope

Tak kisah auto or manual transmission just give your self a distance dengan kereta di hadapan like 3 cars or more

Anything within 60km/h is acceptable with braking and release technique without need doing the low gear things

Once at 30km/h release acceleration and let it role with D will do too when almost reach 60km/h brake slowly until reach 30km/h and let it rolling again

Imagine if u in downslope traffic jam gear no longer can help you because you literally also braking all the way down more than using transmission low gear at the end your brake also over heat

If no traffic jam within 60kmh slow to 30km/h and let it rolling with D it's always work for me.

Can go 2nd gear, rpm high is normal, that is engine braking

If you have not driven for quite some time or you're not comfortable driving up and down steep inclines better take it easy, i.e. nominate another driver or ride a Grab car instead.

the brakepad only wears out fast when being stepped immediately and hard all the time?

Doesn't matter the brake pad worn out fast or slow they're design for this everyday task, Is like chef hand can handle specific heat then release few seconds then grab the hot thing again, if hold the hot object and no release chef hand also injury can no longer holding hot object concept get it?

of cos and the brake fade will happen where the brake will not work anymore, means no brake when you step on it, will need to stop the car and cool down.

If you use L that's mean you 1st gear all the way down. Safest but you will create a long traffic. Drive on left side and give as much space possible to others. Signal to others so they will pass you.

Braking is still "press-let-press-let" and not pressing all the way downhill.

What happens when you have regenerative braking? And you have max charge

Not 1st gear la. You can't hardly drive in gear 1. 1st gear is getting the car moving from standstill, and quickly change to gear 2.

When engage into L (or S), you can still move up to 60-70 kmh. Which is gear 3 if in a manual car.

From the top of Genting going down to where there's the police guard house, this stretch is the steepest and most winding. I would use L (or S) on this stretch, and do less braking.

At the guardhouse where there got road bumps and you need to go very slow, this is where I would change back to D.

I reckon is because younger people these days only drive auto cars all their life, so never had to select their own gears and know the cause and effect.

Hopefully this thread will be informational to many

Regen will be limited and you’ll have to use the brake pedal instead.