If you use synthetic oil, a block heater isn't really neccesary. All a block heater does is prevent the oil from thickening or "gelling" in cold weather. Synthetic oil typically needs to hit temperatures past -50 C before it starts to change viscosity due to tempurature. But make sure you have your engine coolant changed to a Canadian spec if it is an American spec vehicle. The last thing you want is a cracked block from an improper antifreeze mix. If you decide to go with a block heater, most mechanics can install a frost plug style one for around $150-200 bucks. I would recommend booking in with someone like Fountain Tire or Blaskin and Lane, getting it fully winterized (they usually have specials), and have them put in your block heater then. I would do this by the end of october since thats when the winter temps can startb hitting, and after that, you could be waiting a while to book it in.
Hope this helps.
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