When the head corroded through on my 300E I was in the middle of several multi week trips to Europe. As a result the engine sat for a few months total while I was getting the head back and getting time to put it back together. Some pretty serious rust on cylinder walls resulted. I cleaned up with an oily rag as best I could and put the head on.
After going through the oil change regiment that I described earlier all was well. It runs great and uses no oil at all that I can tell.