A BMW Tech told me today's green coolants meet the requirements for the aluminum blocks in the e34 and are perfectly adequate for the purpose. I still bought BMW blue koolaid I had a BMW dealership replace the Aux water pump when i had them replacing the drive belts and doing the State Safety Inspection and i assumed they would flush but they just topped off. My coolant looks bright green but i also added some RedLine Water Wetter just for the hell of it.Supposedly drops the temp 30 degrees..Where do you dispose of the old coolant?