just found out that the previous owner of my car was using g30 coolant and only just found out im supposed to be using g12 or g13? said he flushed and refilled with this coolant just before he sold me the car, which was about 2 months ago. my coolant seems to be leaking. ive used nearly a full 5l bottle of this coolant. could the g30 coolant have caused the leak??