Our motorhome does NOT have a block heater. (No need. Won't be using it when a block heater is required.) But all our other vehicles - gas or diesel - have always come with a block heater and an oil pan heater. Some even have battery blankets. No one would even consider selling a vehicle here in Canada's north without one. (But I'm not sure if they come from the manufacturer installed - or if the local dealers put them in. My understanding is they're not that difficult to put in. I would recommend the extra few bucks for an oil pan heater - and I know they're dead simple to install. I don't think the battery blanket is required.)
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