I've always heard that brake fluid goes bad real fast (IIRC, it absorbs the moisture in the air).
What about power steering fluid?
Can you buy a large container and use it over the years? Or, like brake fluid, should you only buy what you need for one use?
Power steering fluid can be stored for several years in a sealed container. However the standards for power steering fluid vary by manufacturer and model year. The vehicle you are driving 5 years from now may not use the same fluid.
No, it is not as hygroscopic as brake fluid.
However, it can degrade over time - especially if the level is low and it gets overheated, It tends to go brown.
Normally the fluid will only need topping up if there is a leak - I still have a small (1 litre) container I carry in my car due to a previous leak which has been fixed.
