I just did a coolant flush on my ‘99 ex500. It had some super green coolant in it but it looked old so I replaced it with supertech extended life. Said it’s safe for aluminum and free of all the crap that we’re supposed to stay away from. I flushed it only once and the stuff that came out when I did was greenish clear. I wondering if I should have flushed more, and if it’s ok for those two coolants to mix? Probably over thinking it, just making sure I’m not crazy! Thanks!