The bike-only T&T day we did there recently on the Friday before the Pirelli RR round 1 was good. No cars to drop oil

My only major complaint was that the day doesn't officially start until 10am, and on our particular day they were in no hurry and it was a fair bit later than that when it got under way. IIRC we had arrived at the track at 6:30am, and didn't get on track until 11:30am!!! Admittedly we were the last of 3 groups, but the first group only started at 10:30.