Advise from CASE
http://www.case.org.sg/general_advice.html#cars
7) Warranty for the car. If you are purchasing a new car, ask for the warranty. Under the Sales of Goods Act, a product should be of good quality and if bought for a particular purpose, it must be fit for that purpose. Keep all proof of transactions in case of defective products. For second hand cars, there is also limited warranty. Due to previous usage, there could be some wear and tear. If possible, go with someone with experience in buying second hand cars. Question the vendor on the history of the car.? Send the car for inspection immediately if suspect something faulty after purchase.
8) Deposit. Ensure that the contract states in writing that the deposit will be refunded if the loan is not approved.
9) Consider mediation at CASE. Mediation is voluntary, the final decision is made by both parties (and not the mediator), and settlement arrangements are kept private and confidential.
10) With effect from 15 April 2009, motor vehicle dealers must inform the consumer in writing of his refund policy before receiving a deposit from the consumer.