We use Mobil 1 racing oil on all 6 of our race cars. 3 of them being dry sumped set ups.
I know of people that are sponsored by other oil companies, but secretly use Mobil1 as there only real option!
We have many customers that have high performance road cars, that also get some serious track day action, we consider it a must to run on this oil.
Just a couple of things to consider, I'm sure that the VW approved oil is very good stuff, and is more than adequate for road use, but is it designed to cope with the excessive temps that a race track may throw at it, does your car have a high capacity-high flow oil cooler! how about a few seconds of zero oil pressure on a long sweeping bend, while on full chat! and also your mileage!
Your best bet is to get on the phone, or email some race engine builders, their's loads out there! and ask what they would reccomend
Tom
