 The engine design also allows the use of E85 or 87 octane fuel, supports cylinder deactivation, and features dual variable valve timing.Both Direct Injection as well as forced air induction options were engineered into the Pentastar engine's design, however, like cylinder deactivation, these have not yet been implemented from the factory, and remained "on the shelf" as of 2016.For 2016, FCA released an updated version of the 3.6 L engine for the Jeep Grand Cherokee and Dodge Durango.