Hi all. Like a year ago or so, my car began having a humming sound when turning the steering wheel and accelerating a bit. The mechanic said I may be low on steering fluid so he just top it off. I've always checked Power Steering Fluid monthly and the level has been okay. So, today it decided to make that humming sound again, I checked and the reservoir dipstick was completely dry, I can't even see the fluid inside the reservoir. After some investigation and after asking my previous mechanic, he told me that he topped off last time with ATF fluid. Everyone in this country (Venezuela) uses ATF to top off power steering fluid. HOW WRONG! After some extensive research I've found that ATF is really bad for the steering system. I have a complete bottle of 1L of VW CHF11S green power steering fluid, but I wan't to make a system flush. Is 1l enough or do I need more? My main question here is given that there's no CHF11S in the whole country, I have to wait like a month to bring some from the US, can i top off my fluid with vw green one or should I stick with ATF until I get my system flushed out? Thank you and excuse my english.