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there are a few kinds of BH that help cars start from extreme cold weather,2 H; H% }% v5 R# f% i( ^" {
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.. W/ V s5 l# h0 C* D2 h$ w
Either way, the engine shall not be frozen with use of BH.: N3 b; i. n: ?9 {, I
, X, q. b7 b( `If you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.( |9 e; F% {; S3 k3 r" j
A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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