I'd put some grease on/in the connector at the block heater-mine was getting a little corroded looking (%$#! road salt!); I'd be tempted to anti-seize the element if I ever had to take it out.

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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K