I replaced my breather hose on the w126 with a new one that someone gave me. The engine wouldn't run with it on, but ran fine with it off. I ran a piece of wire through the hose and found that it was clogged by mud dobbers. I don't think it's a clogged breather hose, but that's easy enough to check for. If your oil level is low, I would take the top off the oil separator and add oil there to see if it makes its way down to the crankcase. If not, then you have a clogged separator or return.
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Originally Posted by SD Blue
I believe your first suspicion of a clogged breather hose must be the problem. Nothing else will build that kind of pressure, that I can think of. Too much blow-by is very doubtful as I would think the engine wouldn't even start if it was that extreme.
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