Originally Posted by mika33
Yes, that was the actual temperature... the wind chill was around -35°F. But the actual temp dropped to -17°F.
I read the manual and it said the coolant is good until -35°F or so. But the hydrometer showed it was good to -25°F... but the next temperature down was -40°F so maybe -35° is the limit. The hydrometer might not have been that accurate.
If it is still the original factory fill it should be good down to -34 F and I would not change it or add to it unless it is low.