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I would say that your better bet is to run the proper system pressure and keep adding coolant if you're going to run it as-is.
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That is how I see it.
Just keep coolant in the reservoir and I feel you can drive for a long, long time like this. I purchased a 95 E300 that had obviously been driving around for a long time like this. When the dude delivered the car he had two 1 gallon jugs of the green Zerex in the trunk (he had driven up from Tampa, Fla). The worst damage I saw was a little cavitation damage in the area right in front of the water pump impeller. The o-ring at the passenger side rear of the head gasket had failed. The new head gasket does not have this same design.
On the other hand I just purchased a 95 E300 that is right at 250k miles that is sitting in the garage waiting for me to change the head gasket out. I have been maintaining this car for a few years and it just started seeping about four or five months ago. The interior of the car looks brand new. The lady I purchased it from bought a brand new 09 E class bluetec. Wonder if the bluetec will be as good a car as the 95 in fifteen years?