Let me do a simple calulation for you:
Car price: Assume $40,000-$17,000=$23,000*1.25(assuming interest
rate at 2.5%p.a and no dowpayment)=$28,750.
Fixed cost:
monthly installment for car:
$240
Insurance (assuming 25 yrs old and 0 NCD, est $1500pa):
$125 month
Season Parking:
$65
Road tax cost negligible for OPC.
Variable:
Petrol:
$120-150? really depends on how much you
travel.
Shopping Centre Car park and others/ERP?
$50?
Projected cost: $240+125+65+120+50=$600.
Cost doesn't include servicing, change of engine oil, car wash if
any, contingencies etc. Hope this might help.