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there are a few kinds of BH that help cars start from extreme cold weather,0 X# G2 M9 m% q9 }) 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.& ^& K1 x# ?0 L& y% V1 `0 e" W* N! z
Either way, the engine shall not be frozen with use of BH.+ `8 m0 e$ {/ `1 e5 K2 l
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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.% i/ T8 J1 h0 r' a4 {- B
A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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