2012 champion Kazuki Nakajima claimed his second title in three seasons, after a consistent campaign, in which he scored points in each of the nine races to be held.
De Oliveira was the season's most frequent winner, with three victories, winning at Fuji, Suzuka and Motegi.
The only other drivers to win races during the season were Team LeMans' Loïc Duval, who won the season-opening round at Suzuka.
Like Lotterer, he missed a race – at Fuji – as he was still recovering from his accident suffered during practice for the 24 Hours of Le Mans.
Tomoki Nojiri was the season's other winner, winning at Sportsland SUGO for Team Dandelion Racing.