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This is a safety measure. It preculdes the mechanic being harmed by someone turing the ignityion while the engine is being srived. Two, it protects the engine from being run with no or little oil.

This is similar tot he lockouts used by electrical ina plant. The use locks and tags to keep power from being turned on while they are working on a circuit.

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Q: Why does key have to be out of ignition during oil change?
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