About the Evans coolant stuff - has anyone put that in a Mercedes OM617 or OM60x engine? It sounds fantastic at first, but after reading the fine print on their site I have serious doubts. Water pump modifications? Capacity increase required (to 3-4 gallons)? Possible flow issues? It sounds like they cater to American V-8's, I don't know if they even have a clue about Mercedes diesels. But if it is a drop-in replacement, I'm sure interested!