Bought a used car and the coolant was supposedly changed. Cannot identify the brand. It is emerald green. Not the yellowish green stuff. Looking into the radiator the coolant is very clear and the radiator looks like new. I did try the voltmeter test. But not sure that works with the newer coolants. Any idea who makes emerald green coolant? The car is a 99 and the factory fill was the old green stuff. Thanks.