In the past diesel cars received a lot of bad publicity that caused many people to back away from hiring one. However, over the years a series of changes have been made to their engines to guarantee more fuel efficient results and less noise. This is part of the reason you will benefit from diesel Car hire Poland or anywhere else in the world.
However, if you are not thinking about diesel car hire in Poland then you can still hire cars that use other types of fuel. Petrol is also used in Poland, so you will not any problems finding a car there. You will need to weigh your options to ensure that the benefits outweigh the expenses.