The most appealing thing to me, if I relied on them to do my oil changes, would be that I could drive my car in for an oil change while at operating temperature and they would drain the oil right then instead of letting it cool on the lot before getting to it. Oil should be removed just after shutting it down so that all the churned up contaminants are removed with the oil instead of clinging to the sides of the crankcase.
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in