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there are a few kinds of BH that help cars start from extreme cold weather,
3 H( a& X3 }. e7 x9 vbasically , 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.) p7 y% c$ m9 g( A N: ~5 w2 U# r
Either way, the engine shall not be frozen with use of BH.+ G: V+ t: G9 p/ H* J& I
! D: s# `# o; S. _- {5 v$ pIf you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.
+ t5 S6 k6 o& ?1 o# y% FA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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