# API Release - v3.7.0

> UK CO2 range filter, preferred dealer flag for the UK and US, UK model_variant search, exclude_make parameter, new UK dealer and seller fields, and Inventory Ranking API deprecation.



## New features

1. **CO2 Filter for UK Search API:**
2. Introduced the performance_co2_range parameter to filter listings by CO2 emissions.
3. Added range facets for performance_co2 for precise filtering.
4. **Preferred Dealer Flag in UK API:**
5. Enabled a preferred dealer flag for clients to create customized searches and highlight listings from preferred dealers.
6. Preferred Dealer documentation - [Marketcheck API](https://apidocs.marketcheck.uk/#eee8894c-b8f2-4550-9e8c-651ec4c59b36)
7. **Preferred Dealer Flag in US API:**
8. Enabled a preferred dealer flag for clients to create customized searches and highlight listings from preferred dealers.
9. Preferred Dealer documentation - [Marketcheck API](https://apidocs.marketcheck.com/#dcf851b3-866d-4c76-893f-c8c196a67e2f)
10. **Model Variant for UK Search and UK Recents API:**
11. Added Search and facet capabilities for model_variant field
12. **Exclude make for Search API**:
13. Introduced exclude_make in both US and UK active search API



## Optimizations

1. **UK Dealer API Enhancements:**
2. Added new fields: county, fca_status, fca_reference_no, and listing_count to the UK Dealer API.
3. **Car Seller Fields in Listings API:**
4. Added seller information fields under **car_location** (seller_name, street, city, zip, state, latitude, longitude) to the Listings API.



## Other changes

1. **Deprecated Inventory Ranking API**