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From experience, I find the truck starts and runs much better when plugged in at -15C. The truck will start in lower temps then that but it will let you know it's not happy about it. My grill goes on when overnight temps are consistently below 0C. If you are plugging in, do yourself a favor and get a timer. They make them specifically for block heaters to handle the higher amperage that they draw. Your little outdoor light timer will not be enough. Set the timer for 3-4 hours before you expect to leave. Your power bill ... and wife will thank you. 5W40 will definitely help in lower temps but it will still make a racket at -35C unless it's plugged in!
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2003 350 Lariat FX4 Short Box 6.0L *SOLD*
2008 FX4 F350 6.4L Dually Long Box, Black on Black PICTURES
2007 Keystone Raptor 3712TS PICTURES
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