You probably have not notice loss in compression in your engine. 

How can fuel additive clean the carbon build-up in direct injection engine? In a traditional, port-injected engine, the incoming fuel cleans away those oil deposits because fuel enters from behind valve. A direct-injected engine, of course, lacks that feature. The fuel is injected direct into engine chamber away from the valve, meaning any carbon or oil deposit on the valve seat will not get cleaned. 

2024 bmw facelift 320i is 290k++ with 5 year service and warranty. Last year only 280k++

Ah boi, the fluids can be changed. It’s just that service center wouldn’t change the fluids for you and it’s not part of the service menu. If you insist to change the fluids, they want you to sign an indemnity.

But nobody’s stopping you from going outside to have it changed. The same for other fluids as well like aircon compressor fluids.

Mazda the best. Driving RX was the best experience