Leave the O/D on meaning the light on the cluster should
not be illuminating. Saves gas and does not make the engine
work harder. It doesnt give your car a boost of power or anything
like that all it does is prevent you from shifting into 4th gear
which is cruising gear. If you use O/D all it lets you do is
shift from 1,2,3. Only useful when going uphill or passing
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