I think there's a bit of confusion for new Merc buyers, so I will try to explain a little about their Overtrade policy, and I hope other seniors can chip in...
You will see a certain price on places like SGmart, ------ or even on thir brochures and websites.
Then you will be offered the ubiquitous "Overtrade":
Basically it's a discount. BUT the only way you get to enjoy it is if you have a car to trade in.
Essentially Republic Auto - their used car arm will take in your car. Now the amount may vary and it will depend on their current promotion and of course the state of your car.
Eg if they are offering a deal to push the A Class, they will give something like 10k or more to entice you.
This is on top of the buy in value. The buy in value is not as good for cars which aren't near scrap.
If you have a 9 plus year old car, that's the ideal. Then you give it to them upon collecting your car.
So the net discount for you can be
SRP 150 000
OT say 10k
Your scrap value of say 10k
So the NET price of the car is 140k minus the scrap value and the effective amount you pay is 130k. So that's why sometimes you see discrepancies on the amount people say they paid versus the SRP.
Merc isn't the only dealer who does this.
Lexus, BMW etc all offer this, the OT amount may vary. And it's seasonal. Now for example the OT on the C Class, B Class etc isn't high, because they aren't pushing these cars.
So contact your rep (pm me if you do need one) and then compare.
Months before I closed my deal, the price on the car was almost 10k more, then they dropped the price for a promotion.
So put your ear to the ground and wait ... if you can..