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I regularly drive mine at -20f to -35f. Time was when that was our typical winter temp range mid-Dec through Feb. Last 15-20 years we only see temps that low 4-5 days a year; I still use a 50-50 winter mix with power service from Dec - Feb just in case.
Jim
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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)
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