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15W-40 is way too thick for Alberta winter( -30~-40 w/ wind chill). I only use Rotalla T 15W-40 in summer & Rotalla T Synth 5W-40 in winter. the only downside is that 5W-40 lacks of towing power ( tow anything more than 5000lbs, I can feel it!!!). don't know why.
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