That's why on my recent flush i used Volvo.... My dealer gave me 20% off the 25 dollar list, so it was cheaper then the prestone..... and I am a firm believer that for what ever reason the Volco antifreeze has additives that don't react with the aluminum..... I've flushed non-volvo from used bricks that I purchased and the green is almost black..... i flush out add the Volvo AF and two years 50-60k later, still the same green color as the day i put in... I'll pay the price... And since volvo price has not gone up in a couple of years, it's now a bargain!