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there are a few kinds of BH that help cars start from extreme cold weather,
' @5 y" X, o; k8 y3 p* b. Q+ zbasically , 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$ E" M6 r: Q) v' k7 CEither way, the engine shall not be frozen with use of BH.
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. I! k, F; }" X+ _% N; l) E ]5 VIf you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.6 {' G2 B3 b; |. D$ y& s
A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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