If the power steering fluid is not replaced for an extended period, it will gradually deteriorate, oxidize, or become contaminated with metal particles, compromising the performance of the hydraulic power steering system. Initially, symptoms may include heavier steering effort and abnormal noises (such as humming) during low-speed turns, caused by reduced fluid lubricity or air entrainment increasing the hydraulic pump's workload. Persistent neglect will accelerate seal degradation, leading to oil seal leaks and potential damage to the steering pump or gearbox, with repair costs ranging from 1,000 to 5,000 ringgit. While some vehicle manuals don't specify a replacement interval, it's advisable to inspect the fluid every 30,000 kilometres or 2 years. Note that certain older models may use automatic transmission fluid (ATF) as an alternative, while European vehicles like BMW require specialized CHF hydraulic fluid. For DIY replacement, use an oil extractor to remove old fluid and refill, but professional flushing is recommended to ensure complete system purification.
