Hey Vartan
Unfortunately you can not do comparisons like that using custom taxonomies.
Taxonomies are never treated as numeric data so you can perform operations like that in the database..
As is shown in the demo, this field is a custom field / post meta – not a taxonomy.
You will need to add meta data to each post with the year, then you can use the field type “Post Meta” to create a slider.
If you’re not sure how to add meta data to your posts or want something thats really easy I would recommend this plugin:
https://wordpress.org/plugins/advanced-custom-fields/
Make sure you create a number or text field type and add years to all your cars, then you can begin searching! 🙂