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there are a few kinds of BH that help cars start from extreme cold weather,
! j" o* j' h* e' p3 H$ _$ }) Q" Zbasically , 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.8 F7 Y9 W. `2 G0 ^% Y% X- S
Either way, the engine shall not be frozen with use of BH.5 C: x3 ?5 S' j. ]6 O
9 q9 c u' c! l- JIf you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.
' O1 m1 j8 W' j# g6 G4 F/ e2 TA good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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