What kind of oil should be used for power steering fluid?

[VanCarlos]

Automobiles should use No. 8 hydraulic transmission oil, commonly known as steering gear oil or power steering fluid, which can make the steering wheel very light, thereby reducing the driver's steering labor intensity. Introduction to the steering gear: The automobile steering gear, also known as the steering mechanism or steering box, is the most important component in the automobile steering system. It increases the force transmitted from the steering wheel to the steering transmission mechanism and changes the direction of force transmission. Rack and pinion steering gear: The rack and pinion steering gear is one of the most common types of steering gears. Its basic structure consists of a pair of meshing small gears and a rack. When the steering shaft drives the small gear to rotate, the rack moves in a straight line. Sometimes, the rack directly drives the tie rod to turn the steering wheels. It is widely used in automobiles.

[VanKing]

As a veteran auto mechanic with over a decade of experience, I must emphasize the importance of consulting your vehicle's manual for power steering fluid specifications. Most vehicles use either Automatic Transmission Fluid (ATF) or dedicated Power Steering Fluid (PSF), with requirements varying by model. German cars like Volkswagen often require CHF 11S hydraulic fluid, while Japanese models such as Toyota typically use ATF TYPE IV. Using the wrong fluid can have severe consequences - at best causing heavier steering and wheel vibration, at worst damaging the power steering pump. Always observe the MIN/MAX markers on the reservoir; overfilling may cause leaks through seals while underfilling leads to system whining. I've seen cases where people used cheap engine oil as a substitute, resulting in complete power steering system failure - repair costs often exceed fluid expenses by tenfold or more.

[DelElliana]

As a DIY car enthusiast who frequently performs maintenance, I'm always extra cautious when changing power steering fluid. First, it's crucial to determine the correct fluid specification for your vehicle - older American cars typically use ATF Dexron series, while European models may require Pentosin CHF 202. Always opt for manufacturer-recommended fluids, like BMW's Green Oil-specific power steering fluid. During the change process, warm up the engine to improve fluid flow, then disconnect the return line and use a large syringe to extract old fluid. Perform three complete flush cycles for thorough cleaning. Refill with new fluid to the midpoint between level marks, then turn the steering wheel lock-to-lock with engine running to purge air bubbles. Never mix different fluid brands - chemical reactions between incompatible fluids can create sludge that clogs hydraulic lines.

[MacKennedy]

Last month, my car's steering suddenly became heavy. I took it to the 4S shop for inspection, and they said the power steering fluid had emulsified and turned white. The technician explained that this was caused by water contamination or fluid degradation, and it needed to be completely replaced. Nowadays, steering systems are divided into hydraulic and electric types, with older cars mostly using hydraulic power steering, which requires specialized power steering fluid. The fluid standards are determined by three key parameters: viscosity-temperature performance must be stable, ensuring it remains fluid even at -30°C in winter; strong oxidation resistance, maintaining quality for two years; and sufficient anti-wear properties to protect the power steering pump gears. Common types include mineral oil and synthetic oil. Although synthetic oil is more expensive, it has a longer lifespan. Regular checks of the fluid color are crucial—normally, it should be a clear red. If it turns black or thickens, it’s time for a replacement.