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there are a few kinds of BH that help cars start from extreme cold weather,0 w S. H( U3 ~3 W% Y, E
basically , BH keep the car warm by heating up the oil pan-which keeps the engine oil from frozen, or by heating up the coolant, and keep the engine block warm.
W- f3 ?4 @) |1 A5 c- |# iEither way, the engine shall not be frozen with use of BH.) C: O+ b+ a/ Q' s; V% Y; g
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If you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.
7 \, ^4 {1 e& bA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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