http://www.redlineoil.com/content/files/tech/Power Steering Fluid Product Data.pdf
Says it meets the MB and VW/Audi specs.
CHF11s was rather hard to meet, very good low temp handling, high VI, etc. 202 isn't all that difficult to meet, it became Semi-Syn, and it's -52c pour point isn't much better than Redlines -50c, and the Redline will stomp both when it comes to higher temperatures.
Amsoil, doesn't exactly volunteer a lot of info about their PSF, and it's hard to find on their site.
http://www.amsoil.com/storefront/psf.aspx
At it's price, the Redline at 32oz for the same price is a faaar better deal.
Mobil 1 since it was updated to be Dex VI, will probably handle life as well as the Maxlife... Works well for a bit then starts to fail, due to the shearing that happens.
A straight +4 will probably work just fine, as the Audi guys say.
Royal Purple is just purple snake oil, too much hit/miss for me to ever recommend that goo.
Schaeffers doesn't make a PSF.
Pepsi > Coke. Canada doesn't have a corn lobby, so we get sugar in our pop, rather than that poisonous garbage called High Fructose Corn Syrup...