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Message: <blockquote data-quote="jmatt20" data-source="post: 24558" data-attributes="member: 186"><p>who is they?? if you go to car talk .com and search mixing anti freezes they had this exact question, they contacted the engineers at the society of automotive engineers and the answer was the new stuff has rust inhibitors that last 100000 miles while the old style only last 50000 miles . One is more environmentally friendly than the other but nothing extreme will happen . it could be that "they" are trying to sell antifreeze . i don't mix as a rule but i'm not worried about ruining my engine if i happen to top off with a different antifreeze between changes . marking the inside of the door is a good idea... i also mark all of my engines with the amount of oil needed for a change ,with 6 or 7 different vehicles it saves time looking it up....</p></blockquote><p></p>