[BLKSAPPE92]

So I decided to check my coolant reservoirs for fun at about 3,000mi because because all my turbocharged bmw liked to sip the coolant.
E92 335i 6oz every year
F82 & F80 3oz every year secondary systems only
F10 550i 3oz every year both systems

G80's secondary system was 2oz low with 3k miles on it maybe it wasn't properly filled so I added some distilled water and will check it again at Service and let them know of the issue if its low again. (and BMW went back to green coolant)

[breezyrc15]

Where do you check the secondary system? On the right side?

[BLKSAPPE92]

Originally Posted by breezyrc15

Where do you check the secondary system? On the right side?

I haven't looked since the car at 3k on it I think it's at the back of the motor just to the right of the engine by the drive. It's for the turbos and a few other things because the coolant keeps running though the Turbos after it's shut off by a secondary water pump I think we have 1 belt driven water pump and 2 electric it may be 1 electric

[BLKSAPPE92]

So car has 20k miles on it now and I’ve had to top off the primary cooling system twice with about 6oz and the secondary twice with about 2oz of distilled water

[beamlord]

God, no. That is charge air cooling system and its coolant reservoir.
No "secondary cooling systems" 😄

[BLKSAPPE92]

Originally Posted by beamlord

God, no. That is charge air cooling system and its coolant reservoir.
No "secondary cooling systems" 😄

Well of them have been needing top off

[beamlord]

Originally Posted by BLKSAPPE92

Well of them have been needing top off

2oz ? Thats like, half way between min and middle..it's really not much.