When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
There is a difference. Do not mix the two. A complete and thorough flush including draining the engine block needs to occur. There are different schools of thought pros/cons on the two. There has been much dicussion on this board regarding the topic.
They are chemically incompatible and will create a huge MESS if mixed.
Tell your husband to keep the green and demand he get the red.
Dexcool is recomended by GM and after many years of using it in my Cadillacs I am convinced it is superior to the green.