The only way frequent oil changes can damage to an engine is if you leave the filter off, the drain plug out or forget to put oil back in. That will definitely cause damage. Otherwise, if you changed the oil once a week it will NOT cause damage to an engine.
Like 420SEL, I'm awaiting the explanation of how damage is caused by excessive oil changing.
Change oil hot and change oil often,
'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