[jamesh81]

I have a 2021 330i, and there are 2 reservoirs. I've scoured the internet, and I can't find anything with my engine.

Which tank does the coolant go into? Both?

Will Peak work for my model? The label said it works for European vehicles and all BMWs

I've attached 3 photos for reference. Thank you.

[Bc2005]

Owners manual says to top off both reservoirs with coolant of the same color.

Is BMW coolant blue? AFAIK, American cars mostly use green or orange (GM).

[jamesh81]

Thanks. I didn't see that in my owners manual.

The coolant that I picked up is blue.

Originally Posted by Bc2005

Owners manual says to top off both reservoirs with coolant of the same color.

Is BMW coolant blue? AFAIK, American cars mostly use green or orange (GM).

[jzeiler4]

In 2020 or 2021 they switched at the factory from blue to green. My 21 M240 has the new green but I had blue left over and have used a small amount of it.

The larger reservoir is the engine coolant and the smaller one is for the intercooler.