coolant for the ml350
If you live in an extreme climate (very hot or very cold) then it's not a bad idea to keep a mix of anti-freeze and water on hand for adding to the system, since otherwise it can get diluted.
If you need to buy coolant, be sure -- as R2 noted -- to use ONLY MB coolant. You can get it online from several sources for a decent discount from the dealers' price.
Take care and enjoy the ride,
Greg



