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Originally Posted by Habanero
Hatterasguy, your question illustrates the problem I have pinning this problem on one factor. Since no one I know of has owned one of these from day 1, we are all in the dark as to past history and can't say for sure how the car was treated. Mine had green coolant in it when I bought it, also had a cracked head. Does that mean the green coolant caused the crack? Without a whole lot of data and absolutely thorough records, we just can't draw any definitive conclusions. Everything is just a theory.
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I'm not clear on what you mean about the green coolant, or just making a point, however, Green coolant vs. mercedes pink, has only to do with different levels of Ph. The pink is not as acidic as the green and will minimize corrosion pitting that occurs around the head gasket coolant ports, and does not inhibit cooling as far as I'm aware!
I think TOKNOW, (my other email address is "SPARKADUBIE") ha ha, he he, anyway, I think the point is well made with respect to the PC's. My only question with this is do you think higher heat is generated as a result, or no change in heat, but heat concentrated in one area?
Remember nearly all heat generated from the engine is performed between cylinder and head with coolant passing around cylinder sleeves and passage through the head. A lot of the heat within the cylinder is pushed out the exhaust valve. It is my belief now that between the original trap oxidizer, heat generated from higher and more extreme combustion ignition from the turbo and alda fuel enrichments, inclusions and poor castings, and very likely too TOKNOW's observation, all contribute to weaken bond of the molocules in the aluminum head and the area around the exhaust valves and then one day a hose bursts, or the old radiator can no longer keep up with hot summer's day, or the clutch fan has gotten greatly weaker and doesn't turn as fast anymore, or maybe the thermostat, or water pump! It overheats and cracks period...