I've never disconnected the battery for an oil change. I have a hybrid now and with hybrids, it's actually not all that obvious if the ignition is "on" or "off" since the car can be "on" but not have the gasoline engine running.
One of the reasons I decided to change my own oil is reading the horror stories of quick lube places leaving a hybrid in the "on" position, draining the oil, and then having the gas engine start up with no oil.





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