My car has been losing minuscule amounts of coolant over time for years. No visible loss, oil looks fine, never overheats, no issues otherwise. Basically over six months of normal use it’ll go from the max fill line to the min fill line, so I just top it off and keep driving.
My best guess is that it’s seeping out at the water pump or around the radiator, but not enough to be a problem. I am still running the water pump that came on the car in 2009, which I’m guessing is probably a world record.
