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there are a few kinds of BH that help cars start from extreme cold weather,
" T* G% N* Z8 N, u* v* ?- Gbasically , 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.
) J# |( I+ j7 B( WEither way, the engine shall not be frozen with use of BH.+ T3 _& `& j% Z/ D$ ]2 I# _* r6 v ?
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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 K: i; D: m4 {" `" U- |$ uA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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