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there are a few kinds of BH that help cars start from extreme cold weather,0 R$ n8 \5 S5 H: [2 A3 s
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.# I% V( f8 P% `5 A
Either way, the engine shall not be frozen with use of BH.8 t! R# Y) P; 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.7 e( m2 C( A; U2 h
A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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