I have close up and personal experience of both the 2.4 and the 2.5 VM as well as the 2.7 in the Grand Cherokee.
Superb well designed engines.
However the 2.4/2.5 were designed as a part of a series of 3, 4,5 and 6 cylinder marine diesels. They need good cooling and good maintenance.
You have to change ALL the head gaskets at one go AND you MUST retorque them at 1k miles post replacement. This is a pain in the backside to do so is rarely done!
The last 2.5 we re-built is still running well down in Spain, towing up mountains all day 6 days a week with 85k miles since the proper re-build. It's in a 130! Tuned by Alisport to about 140bhp and shed loads of torque (the Turbo comes in very early on the VM).
The heads were done properly as part of the re-build with modern composite gaskets and they were skimmed (as was the block) prior to fitting. A new Turbo was fitted (water cooled) along with a bigger cooler, bigger rad and bigger oil cooler. The engine was stipped to it's basics and re-built.
Watch out for por maintenance