To avoid damage to the power steering pump, don't operate the vehicle for long periods when the power steering fluid level is low.
NOTE.
Use specified power steering fluid.
Inspect the fluid level in the reservoir at each engine oil change with the engine off and cold. Add fluid if necessary; it does not require periodic changing. The level must be kept between MIN and MAX. Visually examine the lines and hoses for leaks and damage.
If new fluid is required frequently, consult an Authorized Mazda Dealer.
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A quick Mazda MX-5 quiz: every answer comes with an explanation and a link to the manual page.