Turbine engine are easy to maintain. They are simple and easy to use. But, they need clean fuel, clean air, and a lot of fuel at sea level. They can run 500-1000 hours without significant maintenance, but at that point they need some general maintenance. ie. filter checks/replacement, nozzle replacements and so on
The attached pic you will see 3000 HP that weighs 785 KGS. This is something a diesel will never come close to matching.