Quote:
Originally Posted by No one
Hi,
Granville is only good to be used the way you did: emergency filling. It seems compatible but anyway it's low quality. There should be a reason you chose BMW over "any other car".  So even though about 1 liter doesn't look much compared to 7(+) liters in total it should be best to replace it with the recommended "official" one after you've solved the leak issue completely. That is, keep driving for a while and make sure the new cap is all it took to fix the issue. Then replace. You might want them to use BMW Genuine Distilled Water to dilute but this shouldn't be important over any distilled water (distilled water is not the same as deionized water, even though very similar  ). My official BMW servicemen used the BMW coolant to top up a bit without diluting it with water, but that could be because I was standing next to them, watching. |
Agree with this. I wouldn't sweat it if it was my car -- you used actual coolant designed for wide compatibility and only a little.
However, as said above, I'd replace all the coolant as some point to BMW spec. After confirming you have no leak, it was just a worn out cap. Which is what it looks like.
Personally, I wouldn't be in a rush to do it. But I also wouldn't live with this non-spec mix for more than several months.
Might never be a problem, but changing it would at least be peace of mind. Which is worth a lot.