Tradingpost has 0 Oldsmobile Ninety-Eight cars for sale above $100,000 in Collaroy, NSW. As Australia's favourite way to buy and sell for over 50 years, Tradingpost is the trusted way to sell your current car, and find your next car at a great price! When looking to buy or sell a Oldsmobile Ninety-Eight always be sure to check out the wide range listed on Tradingpost!