2001 Audi A6 Extended warranty question

Hello,
I joined up with stoprepairbills. Com recently and enrolled in their warranty program. It seemed like a good idea, since I'd like to keep my car about another 100000 miles. I received a package from a company called Prolong Plus this afternoon. There are some additives enclosed that I am supposed to put in my car. There is an engine oil additive, radiator additive, air conditioning spray additive, and a couple of electrical rubber seals. At the time of getting into the warranty program, there was no mention of my having to add anything fluid-wise to my car. I'm very nervous about adding these additives to my car, as Audi's tend to be very particular about what fluids are put in them, as you probably know. This was not brought up to me up front, but apparently the warranty is going through Prolong Plus (Mepla), so I'm not sure what I should do. What is your opinion on this, please?
Sincerely,
Dale Lackey