Was looking on SGCarmart for a Toyota Altis. June 2009 (5 years old) Altis still selling for $65k, about $11k/year depreciation per year. Think brand new is about $110k now, about $10k/year depreciation. Might as well get a brand new car.
If those 2nd hand dealers still don't cut price, the value of the car will just keep depreciating with time.
Loan quantum is different between the two cars.