[ssN52]

So basically I recently traded in my 335d for a '11 328i xDrive and when I looked into the expansion tank there was green coolant (ugh). I'm not risking anything, so I bought 2 gallons of the dealer blue juice and 5 gallons of distilled water. Is this enough water to flush out the old coolant? Or should I buy more?

[b1aze]

Coolant capacity is 2 gallons total (1 gal coolant 1 gal distilled water) so if you use 4 gal of water to flush it, you should be fine.