Still the Avalanche Engine, just a newer updated version that relies on a different lighting system.
The engine powering Mad Max was relying on old lighting paths, whereas the updated version that powers Just Cause 3 is focused on current-gen platforms and features a new lighting system.
However, although they responded on whether or not it is the same exact
engine as Mad Max. They didn't state that the game was incompatible with SLI. Which is what the NVIDIA representative said. At the end of the article it says that Avalanche is listening to the fanbase and will address all the issues they have been hearing. It even suggests that a patch will allow multi-GPU support. Which in the end, what the argument was based on, means that the game isn't incompatible with multi-GPU. It just wasn't implemented at launch. Incompatible meaning not compatible or incapable. Much different than "not at launch."
Side-note: Also added PCLab.pl's benchmarks, and a video performance review by Joker Productions.Edited by BiG StroOnZ - 12/2/15 at 10:25pm