CREATE TABLE table_name_15 (winning_team VARCHAR, date VARCHAR, winning_manufacturer VARCHAR, winning_driver VARCHAR)
What is the winning team of the race on 31 August with Audi as the winning manufacturer and Timo Scheider as the winning driver?
SELECT winning_team FROM table_name_15 WHERE winning_manufacturer = "audi" AND winning_driver = "timo scheider" AND date = "31 august"