The Nurburgring 24h has plenty of corners, but also several long straights. So it's hard to look past the teams and cars who did well in the Manufacturers Series final. That means the 2017 Lexus, Toyota FT-1, Aston Martin Vantage, and Mitsubishi Lancer. Other cars that had the pace to be up there but dropped back were the Subaru WRX (ran afoul of the stewards twice), Mercedes AMG (evil 5 second track limits penalty), and the BMW M6 (got punted).
Out of non-qualifying manufacturers, I do like the Ford Mustang, and the Mazda Atenza got a recent buff too. These two are more suited to power tracks, and conversely the Mitsubishi and Subaru work best on handling tracks or tracks with large elevation changes. I believe the rest are 'true' all-rounders.