in Victoria, Sydney Motorsport Park hosted round four of the championship on the weekend of July 18–19 instead of Winton. The event followed the same format as the previous round but featured a night race on the Saturday night and fans were allowed to attend the event. This spike also caused the Sandown event to be removed from the calendar and replaced with two rounds at The Bend Motorsport Park on the weekends of September 19–20 and 26–27. This calendar revision also saw postponed races at Symmons Plains Raceway, Wanneroo Raceway and a scheduled third appearance at Sydney Motorsport Park cancelled. Rule changes Technical regulations The number of engines that a team was allowed to use has been reduced to three, compared with four in 2019 in a bid to reduce costs. The piston ring and rocker ratios became control components and engines must complete before being rebuilt. Breaking the engine seal before reaching the mileage limit will result in a ten-place grid penalty, similar to Formula One's system of grid penalties for changing engine components. However, engine changes can be made with the approval of Supercars provided that teams present a clear reason for doing so. A control shock absorber manufactured by Supashock was introduced in a bid to reducing costs. All cars had a reduction of downforce of up to twelve percent, in a bid to improve racing and encourage overtakes. The rear wing angle was be reduced from 18 degrees to 13 degrees, and has gurney flaps of 13 millimetres and 10 millimetres on the wing plane and bootlid respectively. The Mustang's rear wing has also moved forward by 90 millimetres and lowered by 50 millimetres. LED panels were to be fitted in the windows of all cars. To accommodate this, the car number on the front windscreen moved from the top-right to top-left corner. Originally scheduled to be introduced from the start of the season, due to production delays its introduction was postponed until 2021. Results and standings Season summary Points system Points were awarded for each race at an event, to the driver or drivers of a car that completed at least 75% of the race distance and was running at the completion of the race. At least 50% of the planned race distance must be completed for the result to be valid and championship points awarded. Bathurst: Used for the Bathurst 1000. Adelaide: Used