-20* and -30* temps are just as hard on vehicle components as extreme heat, both shorten life expectancy, and require more servicing than those in moderate climates.
True... Extreme cold temperatures can affect component material life, like failure caused by shearing or fracturing.
However, most of the conformance testing by the AEC and JDEC, for example, is done at high temperature. The reason is that the components and materials used in automobiles (rubber, polymers, cork, carbon fiber, etc) are typically exposed to self-generated and normal operating heat, not cold. The operating temperature ranges for materials, like rubber or the material used in an ignitor, has a closer high temperature limit to actual vehicle operating temperatures than the cold temperature limit. In other words the typical engine bay temperatures have the highest potential to exceed component and material operating temperature ranges, thereby potentially shortening life, and causing a system failure.
Gnarls.
