Oldtimer GP Nuerburgring

[abzadams]

I'm heading down to the Oldtimer GP later next month in a convoy of pre 73 911"s. Can anybody advise on parking at the ring as I've seen 3 different prices! One is inside parking €20 Euros a day per car, Outside €15 Euros a day per car, and finally parking for visitors for Friday to Sunday €15 euros. The first two are pretty explanatory but where is the 3rd option?

TIA