E70 30D - Green Coolant
 

Hi All,

So the car did have green coolant in which threw me off as BMW use blue and only last year I believe changed to green which this car most certainly wouldn't have been switched to (previous owner had little to no care for the car by the looks of other things)

However, I had a coolant leak occur a few times resulting in probably 10 litre or more of coolant being added Combined with the antifreeze loss when I changed the thermostats as well, would you say to just go with

Adding BMW's coolant now

Flushing again

Top up with green coolant again (which is what exactly?..)

Heres a picture I took when I did the thermostat change and prior to loosing over 10 litres of coolant

https://i.imgur.com/WOBZals.jpeg

It is possibly some generic (Prestone) coolant. I would drain as much as I can and put proper coolant into it.

Agree.


Drain, flush out as much as you can...running hose, whatever... Then a flush with DI water...then a final fill with the correct (BMW) coolant + water


(Im on a well and the water is really bad this year (3 years of drought). Even after the softener...so I wont use it for coolant. I have an RO system, I use that. Or bottled DI water. If your tap water is OK, prolly ok to skip a DI flush)

When I first started doing any type of work on mine I put UV dye in the coolant to help find a leak (wouldn't do that now) and it turned the blue coolant green.