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there are a few kinds of BH that help cars start from extreme cold weather,/ g9 F W3 o& x' _$ n+ L( d3 [
basically , 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.1 ~* i$ L' i+ x+ J
Either way, the engine shall not be frozen with use of BH.5 G2 k; ` ]3 u1 X. [! `( L4 I
8 I0 i( h( c6 {If you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.
: {$ Z7 w: [' ]1 |) QA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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