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there are a few kinds of BH that help cars start from extreme cold weather,
8 h; d7 T" _; ibasically , 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.
8 w* t# Y3 _; Q6 V/ \. C# ^3 zEither way, the engine shall not be frozen with use of BH.+ U" d- M2 ~% U: L, h
0 r3 R" A4 K+ A. I! u/ _If you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.
% V1 D$ G6 ]6 o# qA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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