When it comes to car air conditioning there are two types of gas available, one is an older more common gas called R134a and available for vehicles normally manufactured before 2014. Nearly all vehicles with air conditioning manufactured since 1st January 2017 include the new R1234yf aircon gas which is more environmentally friendly.
Over the course of the year, your aircon gas escapes by about 10%, this means it’s very important to have your vehicle aircon system checked out and regassed at least every two years with new gas and lubricant.