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there are a few kinds of BH that help cars start from extreme cold weather,! x- Z1 b7 \1 O: U4 L* f! v. A
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.+ Q _* T, U8 T @5 K
Either way, the engine shall not be frozen with use of BH.
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# s# A3 M/ y* C, B6 FIf you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.2 ~% C4 Y- f% C/ m- q: Y3 ~" S: C
A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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