Jeep Grand Cherokee is set to replace its V6 engine with a smaller, more efficient four-cylinder powertrain in 2025.The 3.6-litre petrol V6 will be replaced by an updated version of the turbocharged 2.0-litre four-cylinder engine currently used in the Wrangler.The 5.7-litre Hemi V8 is also expected to be phased out across the Grand Cherokee range.There is no confirmation on whether the new Hurricane inline-six engine will be featured in the Grand Cherokee.