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there are a few kinds of BH that help cars start from extreme cold weather,
8 n4 W$ b/ B& N* d& f1 Ubasically , 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.
& ?4 l& L8 V% N- mEither way, the engine shall not be frozen with use of BH.
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, A: \ s5 O9 J3 ~5 g' E* I8 cIf you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.
9 t2 D4 T& V; N1 D! MA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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