Down the left hand side menu at STEP2 you can choose (filter) so it displays only Diesel vehicles. If you are using a mobile look under FILTER at the top of the search results.
Client said:
How about being able to drive to Croatia, Montenegro and Serbia?
Support said:
CROSS BORDER travel will be stipulated at STEP2 of our 3 step online booking process. Next to the car photo of your choice, there is a link “TERMS & CONDITIONS”. Clicking on this link will open an additional smaller window, then choose TRAVEL RESTRICTIONS. Try a few different suppliers as their cross-border policies do vary.