about radiator coolant

[2MIZ129]

Im really low on coolant and I just noticed its green? I know im supposed to have bmw coolant and I do have enough blue to fill up.. I just dont have the time to flush the radiator right now plus I have to replace soon because of a small leak on the bottom of the reservoir.. my question is can i just put some of the bmw coolant? would it be bad to mix it even if its that low? heres a picture to kinda show you how much green coolant ther is

[jca]

I would not mix the coolants. Add more green or perhaps just distilled water until you have time to switch to BMW blue coolant. Don't let not having time to flush the system keep you from changing out the coolant. Most recommend new coolant every two years for BMW's. Good luck, John