overtrade can be given with or without trading in a car. when i bought my first car, i was given an overtrade as well even though there is no car to trade in. the overtrade amount was added to the car's actual selling price and declared in the bank loan form.
example
overtrade given is 6k
car actual selling price is 80k
bank loan form put car's selling price at 86k
Mentholatum, don't need to get flustered over this confusion. at the end of the day, what you need to know is these amounts
how much loan outstanding (if any) you have to bank for existing car and what is the final settlement amount - $A
how much is PML going to buy this existing car from you - $B
how much $ you need to top up or get back - top up is when $A > $B and top up amount is $A - $B. get back amount is when $B > $A and amount back is $B - $A
if you are getting back $$$ from PML for selling your existing car, let's name this amount $C.
how much are you going to put as downpayment (including booking fee) for the new car from PML? - $D
what is the price of the car PML is selling you - $E
so your loan amount should be $E - $C - $D
now let's give an example with values
current outstanding loan for car - $10k
PML paying for your car - $15K
money back from sale of car and settle loan - $5K
downpayment for new car - $20K
new car price - $200K
total loan needed = $200K - $5K - $20K = $175K
of cos if you decide to use the extra $ from sale of car as part of downpayment, then the loan needed will be $180K in the above example.
if you did not notice, i had not factored in the overtrade $$$ in my above example. why? cos at the end of the day, the overtrade is just a number which is irrelevent. what's most important is the actual $$$ you need to transact and not some virtual $$$ like overtrade.