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there are a few kinds of BH that help cars start from extreme cold weather,
+ w3 Z3 ]& l0 O4 U/ K" S' D) \2 dbasically , 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.% h: ?# R; r* ~6 A1 C7 j
Either way, the engine shall not be frozen with use of BH.' p) K4 M x" m/ t3 @+ c2 r( A
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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.0 {% ?/ |6 F' o
A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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