I have had similar problems with USH engines. Rather than oil, which tends to migrate, you might try conductive paste. I use Gardner-Bender "Ox-Gard", after founding out that it works excellent in outdoor ground light sockets. I have used it on several engines with no recurring problem. Before applying it, I used 320 grit sandpaper to remove the tarnish buildup on the bolsters. I do not know if it just eliminates tarnish buildup, or if it is conductive, but I believe it is. I understand there is a similar product called "No-Ox" (or a similar name) but have not tried it.
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