By Tim Porter, C-380 #199, “Serendipity” Mainsheet, November 2009 When I purchased my 1999 C-380 in 2008, the steering was very tight.  I later determined someone had greased the lower rudder bearing with petroleum-based grease, which is very detrimental to Marelon, the material from which the bearings are made.  Petroleum grease causes Marelon to swell, which caused the bearing to…