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You want the teenager overeager to use an impact wrench to replace hub motors? I would not expect them to be as fast as a technician. Four hours x $50 hourly = $200. If they manage to drive the average 15,000 miles a year, that is $200 in maintenance every sixteen months. Let's say that replaces a car with a $30 oil change every 4,000 miles.
There are many aspects to vehicle maintenance, but that trade-off is now 50% more expensive.
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