At your location, just use 5W30 as mentioned and slap an oil pan heater pad on that thing. Red RTV, duct tape, zip ties, done.

Block heaters do fail, but rarely. Corrosion is usually the culprit, for those who use tap water to mix their A/F.

Depending on the hose-type heater for coolant, you have to install them in-line. Disclaimer is to follow the mfr's instructions.

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