When air gets trapped in the cooling system, Dexcool has this habit of turning into mud/sludge looking mess - On GM cars, I have seen this firsthand; if you're looking to purchase a GM car that is running Dexcool, first thing to check BEFORE a testdrive is the radiator cap; open 'er up & look for mud on the cap seal... if you see any, run away! Soon you'll be replacing the radiator, hoses, heater core & flushing the mess out of the system. If you're lucky, you won't be changing the haed gaskets yet... Shops I used to call on would ditch the Dexcool & refill back with green coolant after doing engine/cooling system repairs on out of warranty cars.

I haven't had time to follow all the posts, but are some people switching their Benz cooling systems over to Dexcool? Why?

BNC