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Thanks for the responses. Being in Alberta, it's mandatory all new cars come with block heaters. I do use it, but it's not always possible. Sometimes when it's not possible to plug it in, you forget to go out and run the car for 20 mintues every 4 hours or so. At -30c or lower, I'm going to take all the help I can from the oil being thinner at non-operating temperature. Even with the car plugged in, a start at that low a temperature is not super easy.
If I do change the oil myself, I can certainly keep receipts, but I imagine an argument from the dealer going something like "just because you bought the oil doesn't mean the oil was changed, etc." Whereas a receipt from an actual oil change place is a pretty good record that they actually changed the oil (and hopefully filter). Plus if I bought 0w20, I'd be buying more than 1 oil change all at once, so there'd be a receipt for enough oil for say 2-3 changes. Then it's just my word that I kept the schedule for oil changes.
I'll try and get ahold of the service manger tommorow.
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