Hydraulic Jack Fluid

westslope Sep 1, 2020

  1. westslope

    westslope First Fill-Up (of many) Supporting Member

    Messages:
    298
    Location:
    Wildfire country, BC
    I own a Performance Tool 3 1/2 ton low profile jack. Works very well.

    After a half dozen years, i want to change the jack's hydraulic jack fluid. So I picked up a bottle of ISO AW32 anti-wear hydraulic jack oil at our local Crappy Tire before I consulted the manual.

    The Performance Tool jack manual calls to "...use only hydraulic fluid with a rating of SAE 20 for refills." The manual also calls for the fluid to be re-filled every three (3) years....

    Question: Can I safely use the ISO AW32 oil in the jack or should I hold out for SAE 20, and if so, where can I find it?

    Here is a: SAE-to-ISO Oil Conversion Chart

    According to the chart, it appears that I should be looking for a SAE 20W/AW68 hydraulic oil. Any help here would be appreciated.
     
  2. jsexton

    jsexton Wheeling Supporting Member

    Messages:
    504
    Location:
    Lewis Center, OH
    I'm not an expert, and I'm not saying you should, but I personally would use it and not think twice about it. It should be quite a bit better in cold weather too.

    People use automatic transmission fluid in hydraulic jacks all the time too.
     
  3. TheCrabby1

    TheCrabby1 Bumpers Installed Supporting Member

    Messages:
    1,192
    Location:
    Burtonsville, Md
    Some of the Commercial fishermen will add brake fluid to the hydraulic fluid when they develop a slight drip around a hydraulic piston or orbital motor seal . Something in the brake fluid tend's to make the o-ring/seal swell up slightly. There's my 2 cent's ; As for the jack I'd use what they call for.
     
  4. TerryD

    TerryD Total Tease Supporting Member

    Messages:
    2,713
    Location:
    Covington, Va
    You'll need to use heavier fluid than the AW32. The thinner oil will most likely leak worse since the seals are designed for the heavier fluid.

    Also it may be a lubrication concern for the pump. Those pumps make a lot of pressure which can create a good bit of heat, even in the short amount of time they actually operate during a lift.
     
    westslope and TheCrabby1 like this.
  5. General_Tarfun

    General_Tarfun Need Bigger Tires Supporting Member

    Messages:
    675
    Location:
    Atlanta, GA
    It held the fluid for that long? The piece of junk I bought at walmart leaks continually. You definitely get what you pay for.
     
  6. westslope

    westslope First Fill-Up (of many) Supporting Member

    Messages:
    298
    Location:
    Wildfire country, BC
    Thank you for all the comments. I have been "up north" for a bit, with no or shoddy connections to the web.

    I looked at the US harborfreight.com site and immediately found STA-LUBE 15 Oz Hydraulic And Jack Oil explicitly described as "SAE grade 20 weight". In-store only.

    I am inclined to agree with TheCrabby1 and TerryD. I will keep looking. In the meantime, a few Canadian on-line sources do not mention the SAE grade weight. Annoying....

    G_T: The Performance Tool jack performs well, without any mishaps to date. It has proven quite stable. Mind you, I get the truck on 6-tonne jack stands as quickly as possible.
     
    Last edited: Sep 30, 2020 at 8:43 PM

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