u/Cheap_Associate_7551

Is the maintenance that comes with diesels truly as bad as people say specifically for the 17-19 6.7 power stroke? It wouldn’t be a daily but it is my dream truck and was wondering how bad maintenance truly is?

I am taking a nocti test for an industrial maintenance spot what should I study and are there any websites I can study on that will give similar questions to it without paying an arm and a leg?