What oil can be used as a substitute for a jack?

[Serenity]

A jack can temporarily use hydraulic oil as a substitute, but it should be replaced promptly. Flat base: When using a hydraulic jack, place a flat, sturdy, and oil-free wooden board underneath to expand the pressure-bearing surface and ensure safety. Do not use an iron plate instead of a wooden board to prevent slipping. Smooth start: Lift smoothly. After slightly raising the load, check for any abnormalities. If there are no issues, continue lifting. Do not arbitrarily lengthen the handle or operate too forcefully. Avoid overloading or exceeding height limits. When the piston rod shows a red line, it indicates that the rated height has been reached, and lifting should stop.

[McWillow]

I just researched this, hydraulic jacks must use dedicated hydraulic oil! Regular engine oil is too thin and prone to leakage, while gear oil is too thick and affects lifting speed. A friend tried using brake fluid which corroded the seals, rendering the jack useless. I recommend purchasing anti-wear hydraulic oil—check the manual for the required specification. In emergencies, ATF transmission fluid can temporarily substitute, but it should be drained and replaced as soon as possible. Remember to thoroughly clean the cylinder before refilling; mixing oils can clog the valves. Last time I serviced my scissor jack, I found metal shavings in the oil. After draining, I refilled with ISO VG32 hydraulic oil, and now the lifting action is much smoother.

[LeAnthony]

An experienced mechanic at the auto repair shop said that a jack is like a human joint—it requires the right lubricant. Don't randomly add engine oil or grease; hydraulic systems need low-viscosity, anti-emulsification specialized oil. Commonly used options are L-HM32 or AW46 anti-wear hydraulic oil, suitable for both winter and summer. The hydraulic oil should cover two-thirds of the piston rod—too little and there's insufficient pressure, too much and it may spray out. Once, a neighbor used peanut oil as a substitute, and the piston seized up and rusted directly. The oil change interval depends on usage frequency—once a year for household cars, but every quarter for repair shops. If there's an oil leak, check the sealing ring first; a worn-out oil seal is more critical than low oil levels.

[Carolyn]

I've changed the jack oil three times myself, and the experience is to prioritize anti-wear hydraulic oil with a high viscosity index. The green can of AW32 hydraulic oil from auto parts stores is sufficient, costing 50 yuan per liter to maintain three jacks. Never mix hydraulic oils from different brands, as the chemical additives can react and coagulate. Last time, I noticed the lifting was jerky, and upon disassembling the bottom of the oil cylinder, I found sludge deposits, which were resolved by cleaning with kerosene. An emergency solution is to add a small amount of transmission oil, but it can only last for two or three operations. Remember to lay the jack completely flat when changing the oil, as incomplete air removal can affect its load-bearing capacity.

[AlessandraFitz]

Hydraulic jack oil requires viscosity matching. Scissor jacks for compact cars use low-viscosity ISO VG15 oil, while large hydraulic jacks in repair shops require VG46. Avoid continued use when oil temperature is too high, as heat thins the oil and causes internal leakage. Stop using immediately if oil leakage is detected – a colleague's cylinder cracked last time, spraying hydraulic fluid three meters away. When purchasing oil, look for anti-wear, anti-rust, and anti-oxidation certifications. The oil change process is simple: open the pressure relief valve to drain old oil, clean the oil chamber, then refill with new oil to the midpoint of the sight glass. Always keep hydraulic oil in your toolbox for safer emergency rescues.

[Lucia]

The maintenance manual specifies that the hydraulic oil should be replaced every two years or after 50 lifts. It is recommended to use anti-wear hydraulic oils such as Mobil DTE 24 or Shell Tellus S32. In cold winter regions, opt for L-HV low-temperature hydraulic oil with a lower pour point. Pay attention to three practical points during operation: filter the oil through a mesh to prevent impurities from entering; new oil should appear as clear amber; the drain bolt is magnetic to attract iron particles. Using the wrong oil once caused the jack to automatically descend after lifting, which was found to be due to internal leakage from excessively low viscosity. Insufficient oil is most dangerous when lifting heavy loads, and extra caution is needed when the edges of the load capacity plate are worn or ineffective.