small amount of green liquid in 1999 infinity i30 limited?

[Tank50]

my 1999 infinity i30 limited that i just got has a green liquid coming out of somewhere in the engine.
i think i might have put to much oil in the engine and water in the coolant box.
the car temparature is perfect and it is driving just fine ..
can this be an overflow ?
what is it?

 

[guitardc59]

Green liquid would be your antifreeze. Check for leaks starting with the radiator, radiator hoses (there is one upper which flows into the thermostat, and one lower return from the block), the thermostat gasket, and in a worst case scenario, a leaking head gasket. The head gasket would really only allow coolant into the cylinder (and you would see white smoke in your exhaust, which white smoke represents steam), so check these aforementioned trouble spots.

 

[Infiniti Parts Department]

If you overfilled the coolant overflow bottle it is very possible it is overflow. Check that the level is not past the full mark.