The first six hours are complete in the 2020 Rolex 24 At Daytona, to kick off the new IMSA season.

Track conditions at the 3.56-mile Daytona International Speedway has been the primary story thus far, with a few incidents peppering the way.

Michelin engineers have reported temperatures that have swung nearly 10 degrees ambient and more than 20 degrees on track. The race start of 67 degrees ambient and 82 track just after 1:30 p.m. ET, under clear and sunny skies, down to 58 degrees both ambient and track as of the six-hour mark at 7:40 p.m. ET.

An incident between the Precision Performance Lamborghini and Heart of Racing Aston Martin, the latter incurring significant front end damage, brought out the race’s first full course caution.

Meanwhile an earlier incident between Harry Tincknell’s Mazda and Helio Castroneves’ Acura DPis left the Penske Acura behind the wall for multiple laps for repairs, and Castroneves not thrilled by Tincknell’s pass attempt to the inside of the Bus Stop chicane.

All four WeatherTech Championship classes (DPi, LMP2, GTLM and GTD) are all either around or north of 200 laps through six hours. The overall lap record number is 808, set two years ago in 2018.

Class leaders at the six-hour mark are below. Of note, this race also serves as the kickoff to the IMSA Michelin Endurance Cup, which rewards performance in IMSA’s four longest races. IMSA awards points at the six, 12, 18 and 24-hour marks.

HOUR 6 STANDINGS

• DPi: 1. No. 10 Cadillac, 2. No. 31 Cadillac, 3. No. 6 Acura
• LMP2: 1. No. 52 ORECA, 2. No. 8 ORECA, 3. No. 81 ORECA
• GTLM: 1. No.  24 BMW, 2. No. 912 Porsche, 3. No. 911 Porsche
• GTD: 1. No. 44 Lamborghini, 2. No. 63 Ferrari, 3. No. 48 Lamborghini