Its a block heater. It mostly heats up the coolant, but will help keep the oil temp up as well. Its pretty useful if its below ~40* or so.
Even down around 0*, you only need to plug it in ~3 hours or so before you start it. Its a 900watt or so heater (on the 6.0 version at least), so running it all night is useless unless you wanna just use up energy.
--Jeff
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2009 Supernova 6372
Sold: 2005 6316 Ultra Super C
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