Bought a used GR2120, not knowing when last maintenance I changed oil and filter. Drained and flushed radiator (green coolant), had new RED Toyota coolant filled up with it. Now I am paranoid that I should have used green stuff.....I looked it up on the google....seems like it should be ok, other then never to mix. Am I ok, or should I switch out. I flushed it really good before filling.....any ideas let me know. I only ran it around the yard, then back to the garage.....