Penrite Power Steering Fluid 500ml used for re-fill or top-up ATF PSF0005 Power Steering Fluid "with Stop-leak Additive Technology" is a premium mineral based, multipurpose power steering fluid designed for use in power steering units that specify conventional type Automatic Transmission Fluids (ATF's) i.e. DEXRON II & III Fluids. It contains special anti-shudder additives not found in ATFs, that are designed to provide enhanced wear protection, longer service life and reduce noise in all conditions. It is also formulated with "Stop-leak Additive Technology" to minimise leaks due to deteriorated or worn seals and gaskets.