Oil from your skin leaves a residue on the glass shell to the bulb. When the bulb is turned on, it begins to get hot. Much of this heat is dumped into air around the bulb and is carried away. However, when there is oil on the bulb, it begins to get heated as well. The heat is actually enough to cause oil to boil and its temperature can reach near 1,100 Fahrenheit. This "hot spot" puts a great deal of heat near the glass bulb and can cause glass in the hot spot to warp and stretch. This causes a weak spot in the glass bulb which can break and thus shortening life span. The other choices will not happen.

ASE identifies auto maintenance and light repair as an individual service area. The auto maintenance and light repair service area involves the following components: Engine Systems, Automatic Transmission/Trans-Axle, Manual Drive Train and Axles, Suspension and Steering, Brakes, Electrical and HVAC.