I have my B8 S4 booked in for stage 2 in a few weeks. I was looking to have it serviced prior to hitting the rollers. I was wondering if any of you are using an upgrade oil in these circumstances? I have heard Miller Nano CTS mentioned equally a few people seem to rave about 0/30 Mobil 1. The garage that service my car have said the factory specified 5/30 will suffice but they don't do tuning. Any suggestion welcome.
