The coolant is old, broke down, and needs replaced.
If the coolant is brown, it has broken down and needs replaced. You could also have a failed thermostat, plugged radiator, inoperative fans,...........
If you waited until the coolant is brown you waited too long. Have the system professionally flushed at that point.
It might, or it might turn the coolant white or milky or it can end up being dark brown globs.
There is no process in the body that would cause urine to be greasy. If ut seems that urine is greasy then look for something outside the body, such as Vaseline or ointments used in that area.
i would start with fixing coolant problem brown coolant indicates there is oil in your coolant which indicyrs either a blown head gasket or a cracked head you fix that problem and more than likely, the surging problem will go away
Yes, I would.
something Greasy.... McDonalds??
head and shoulders
I don't know the reaction it would have on the coolant but I would advise you to flush out your system immediately and put in fresh coolant.
That would possibly be a diamond.