I got the opportunity to talk with my previous owner about my vacuum pump (79 300sd) He told me that he rebult it himself with a diaphram of his own making. Should I be concerned with this. The guy is pretty mechanical but I did see some oil in the lines when I was messing with the vacuum lines (thread a few days ago)
http://www.peachparts.com/shopforum/showthread.php?threadid=33419
Could this oil have been there from before or do I need to worry?