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there are a few kinds of BH that help cars start from extreme cold weather,
/ T/ p! W9 e M3 v6 z' K' Xbasically , 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& j+ @9 w7 r# g3 i f7 |, A5 B6 x
Either way, the engine shall not be frozen with use of BH.' l$ O" `7 W+ V" ?2 }
@# S# G5 }. m! |; u$ mIf you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.4 M5 f$ H |, z/ d
A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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