Being in Canada, go with 87C. Only those who's summer temps hit 100F+ should be considering the 79C. Anybody else is just masking other problems.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k