I have seen new rebuilds fail in a short time due to a head gasket failure, the area between coolant and oil passageways is pretty close at some areas, in this case a 202 with a big V8, an S420 developed an oil leak out of the head.
The replacement used a Reinz gasket instead of OE gasket and it was visibly improved in the area that failed, using some copper cross hatch material that constitutes a sort of crush washer to make a more effective seal.
Using the best head gasket is very important, and there are differences!
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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