Porsche achieved another milestone at the Mobil 1 Twelve Hours of Sebring: the Porsche Penske Motorsport Porsche 963s clinched a one-two finish, repeating last year’s result and handing the Stuttgart sports car manufacturer its 20th outright victory at the endurance classic. Daytona winners Felipe Nasr, Julien Andlauer and Laurin Heinrich earned the top spot in Florida in a gripping battle against fellow Porsche drivers Kévin Estre, Laurens Vanthoor and Matt Campbell. In the GTD Pro class, customer teams Manthey and AO Racing brought home first and…