![My coolant reservoir has this orange stuff, looks like rust, what can it be ? I just bought this car, and I'm trying to do myself the maintenance : r/BMWE36 My coolant reservoir has this orange stuff, looks like rust, what can it be ? I just bought this car, and I'm trying to do myself the maintenance : r/BMWE36](https://preview.redd.it/plojdz4moq661.jpg?auto=webp&s=45b159d471d032c8eb85c037b19655083a5add7d)
My coolant reservoir has this orange stuff, looks like rust, what can it be ? I just bought this car, and I'm trying to do myself the maintenance : r/BMWE36
![Green Coolant/Antifreeze mixture has turned orange due to small residual amount of orange coolant left in expansion tank - new coolant is Prestone's (green, concentrated mixed 2:1 with water). Is this going Green Coolant/Antifreeze mixture has turned orange due to small residual amount of orange coolant left in expansion tank - new coolant is Prestone's (green, concentrated mixed 2:1 with water). Is this going](https://preview.redd.it/xn099i7vh2x71.jpg?auto=webp&s=15673aacaf145248ad8f5c17c356cdbe5d697033)
Green Coolant/Antifreeze mixture has turned orange due to small residual amount of orange coolant left in expansion tank - new coolant is Prestone's (green, concentrated mixed 2:1 with water). Is this going
![Radiator Fluid Coolant Reservoir Tank For Suzuki Forenza Reno 04 08 2004 2010 For CHEVROLET OPTRA 2.0L| | - AliExpress Radiator Fluid Coolant Reservoir Tank For Suzuki Forenza Reno 04 08 2004 2010 For CHEVROLET OPTRA 2.0L| | - AliExpress](https://ae01.alicdn.com/kf/Sd21432ecf85341349937dc821c8f3a69i/Radiator-Fluid-Coolant-Reservoir-Tank-For-Suzuki-Forenza-Reno-04-08-2004-2010-For-CHEVROLET-OPTRA.jpg)