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there are a few kinds of BH that help cars start from extreme cold weather,
3 h/ |" m4 G. o& ]3 e" G5 `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.6 X' L6 J) I/ Y" z# q" o8 s& g
Either way, the engine shall not be frozen with use of BH.7 M: U% {( \8 b! v; S0 d+ j+ _
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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.
' l+ V& X% a% ? t+ YA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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