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there are a few kinds of BH that help cars start from extreme cold weather,+ }( `' I) |2 ^* F
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.* E4 |' [2 V" O/ c# A4 n! B
Either way, the engine shall not be frozen with use of BH.4 p: |3 n' [- y& d9 W8 m6 W
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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.
1 ]( b& i0 N2 H, yA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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