Which power steering fluid? (G002000 for 2003 Audi S4 B6)

[psymonr]

Hello all,

I've checked my power steering fluid level an it is low, I'm not sure if this is just due to the age of the car, or a leak, but I want to just top it up to ascertain whether it is a leak or not. I can't get to a dealer or VW Audi specialist today to purchase some direct, does anyone know of a suitable castrol etc. product that I can safely top up with? The grade on the filler cap is G002000 non mineral, which I believe is Pentosin CHF 7.1,

Thanks,