The coolant that’s in it now is the Mini/BMW brand coolant that the factory would have put in it which is what the dealer put in. I’ve been told by a indy Mini service to top off the coolant expansion tank with a G48 coolant like the Mini/BMW brand or a brand like Zerex. A neighbor that has a similar Mini says he uses the Supertech OE Teal. He says that it’s rebranded Prestone G48 but idk if that’s true. So the Supertech OE Teal is G48 comparable?
Zerex G48 says it’s low silicate (HOAT) and Supertech OE Teal says it’s silicated (SOAT). The Mini parts department says that my Mini takes G48 coolant and the Zerex says Mini on the bottle. The Supertech just says BMW and doesn’t say G48 but it comes up as compatible with my Mini on Walmart.com