This is it, they can use there prop 65.

The city explains that auto repairs can release chemicals harmful to the environment if not handled properly, and that if repairs are allowed on vehicles not owned by the homeowner, it can increase auto traffic in neighborhoods.

23 pages of banned chemicals

https://oehha.ca.gov/media/downloads/proposition-65//p65list010320.pdf

I wonder what some health stats are for cali vs other states.

So in cali I could shoot up and get free needles, steal, sleep anyplace, but yet cant change my own oil.